| **Description Of Business And Significant Accounting Policies (Policy)**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Description Of Business                                                             | Description of Business:  Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) participate in the Electronic Manufacturing Services (“EMS”) industry. Plexus delivers optimized Product Realization solutions through a unique Product Realization Value Stream services model. This customer focused services model seamlessly integrates innovative product conceptualization, design, commercialization, manufacturing, fulfillment and sustaining services to deliver comprehensive end-to-end solutions for customers in the Americas ("AMER"), Europe, Middle East, and Africa ("EMEA"), and Asia-Pacific ("APAC") regions. Customer service is provided to over 140 branded product companies in the Networking/Communications, Healthcare/Life Sciences, Industrial/Commercial and Defense/Security/Aerospace market sectors. The Company's customers’ products typically require exceptional production and supply-chain flexibility, necessitating an optimized demand-pull-based manufacturing and supply chain solution across an integrated global platform. Many of the Company's customers’ products require complex configuration management and direct order fulfillment to their customers across the globe. In such cases Plexus provides global logistics management and after-market service and repair. The Company's customers’ products may have stringent requirements for quality, reliability and regulatory compliance. Plexus offers its customers the ability to outsource all phases of product realization, including product specifications; development, design and design verification; regulatory compliance support; prototyping and new product introduction; manufacturing test equipment development; materials sourcing, procurement and supply-chain management; product assembly/manufacturing, configuration and test; order fulfillment, logistics and service/repair.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Consolidation Principles And Basis Of Presentation                                  | Consolidation Principles and Basis of Presentation:  The consolidated financial statements have been prepared in accordance with generally accepted accounting principles and include the accounts of Plexus Corp. and its subsidiaries. All intercompany transactions have been eliminated.The Company’s fiscal year ends on the Saturday closest to September 30. The Company also uses a “4-4-5” weekly accounting system for the interim periods in each quarter. Each quarter, therefore, ends on a Saturday at the end of the 4-4-5 period. Periodically, an additional week must be added to the fiscal year to re-align with the Saturday closest to September 30.  The accounting years for fiscal 2012, 2011 and 2010 each included 364 days.The Company’s reportable segments consist of the AMER, APAC and EMEA segments. Refer to Note 12, "Reportable Segments, Geographic Information and Major Customers," for further details on reportable segments.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Cash Equivalents And Short-Term Investments                                         | Cash and Cash Equivalents:  Cash equivalents are highly liquid investments purchased with an original maturity of less than three months and are classified as Level 1 in the fair level hierarchy described below.  As of September 29, 2012 and October 1, 2011, cash and cash equivalents were the following (in thousands):  2012 2011Cash $124,648 $93,587Money market funds and other 172,971 148,520  $297,619 $242,107                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Inventories                                                                         | Inventories:  Inventories are valued at the lower of cost or market. Cost is determined by the first-in, first-out (“FIFO”) method. Valuing inventories at the lower of cost or market requires the use of estimates and judgment. Customers may cancel their orders, change production quantities or delay production for a number of reasons that are beyond the Company’s control. Any of these, or certain additional actions, could impact the valuation of inventory. Any actions taken by the Company’s customers that could impact the value of its inventory are considered when determining the lower of cost or market valuations.Per contractual terms, customer deposits are received by the Company to offset obsolete and excess inventory risks.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Property, Plant And Equipment And Depreciation                                      | Property, Plant and Equipment and Depreciation:  These assets are stated at cost. Depreciation, determined on the straight-line method, is based on lives assigned to the major classes of depreciable assets as follows: Buildings and improvements 15-50 yearsMachinery and equipment 3-10 yearsComputer hardware and software 3-10 yearsCertain facilities and equipment held under capital leases are classified as property, plant and equipment and amortized using the straight-line method over the lease terms and the related obligations are recorded as liabilities. Lease amortization is included in depreciation expense (see Note 4, "Property, Plant and Equipment") and the financing component of the lease payments is classified as interest expense.For the capitalization of software costs, the Company capitalizes significant costs incurred in the acquisition or development of software for internal use, including the costs of the software, consultants as well as payroll and payroll-related costs for employees directly involved in developing internal use computer software once the final selection of the software is made. Costs incurred prior to the final selection of software and costs not qualifying for capitalization are expensed as incurred.Expenditures for maintenance and repairs are expensed as incurred.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Impairment Of Long-Lived Assets                                                     | Impairment of Long-Lived Assets:  Long-lived assets, including property, plant and equipment and intangible assets with finite lives are reviewed for impairment and written down to fair value when facts and circumstances indicate that the carrying value of long-lived assets may not be recoverable through estimated future undiscounted cash flows. If an impairment has occurred, a write-down to estimated fair value is made and the impairment loss is recognized as a charge against current operations. The impairment analysis is based on management’s assumptions, including future revenue and cash flow projections. Circumstances that may lead to impairment of property, plant and equipment include reduced expectations for future performance or industry demand and possible further restructurings, among others.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Revenue Recognition                                                                 | Revenue Recognition:  Net sales from manufacturing services are recognized when the product has been shipped, the risk of ownership has transferred to the customer, the price to the buyer is fixed or determinable, and recoverability is reasonably assured. This point depends on contractual terms and generally occurs upon shipment of the goods from Plexus. Generally, there are no formal customer acceptance requirements or further obligations related to manufacturing services; if such requirements or obligations exist, then a sale is recognized at the time when such requirements are completed and such obligations are fulfilled.Net sales from engineering design and development services, which are generally performed under contracts with a duration of twelve months or less, are typically recognized as program costs are incurred utilizing the proportional performance model. The completed performance model is used if certain customer acceptance criteria exist. Any losses are recognized when anticipated. Net sales from engineering design and development services were less than five percent of total sales for each of fiscal 2012, 2011 and 2010.Sales are recorded net of estimated returns of manufactured products based on management’s analysis of historical returns, current economic trends and changes in customer demand. Net sales also include amounts billed to customers for shipping and handling. The corresponding shipping and handling costs are included in cost of sales.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Income Taxes                                                                        | Income Taxes:  Deferred income taxes are provided for the difference between the financial statement balance of assets and liabilities and their respective tax basis. The Company records a valuation allowance against deferred income tax assets when management believes it is more likely than not that some portion or all of the deferred income tax assets will not be realized (see Note 7, "Income Taxes"). Realization of deferred income tax assets is dependent on the Company’s ability to generate future taxable income. Recognition of deferred income tax assets is evaluated and tax reserves are recorded to address potential exposures related to income tax positions taken by the Company. These reserves are based on the assumptions and past experiences of the Company and provide for the uncertainty surrounding the application of statutes, rules, regulations, and interpretations to its income tax filings. It is possible that the actual costs or benefits relating to these matters may be materially more or less than the amount the Company estimated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Foreign Currency Translation                                                        | Foreign Currency Translation:  The Company translates assets and liabilities of subsidiaries operating outside of the U.S. with a functional currency other than the U.S. dollar into U.S. dollars using exchange rates in effect at year-end. The Company translates net sales, expenses and cash flows at the average monthly exchange rates during the respective periods. Adjustments resulting from translation of the financial statements are recorded as a component of “Accumulated other comprehensive income”.  Exchange gains and losses arising from transactions denominated in a currency other than the functional currency of the entity involved and remeasurement adjustments for foreign operations where the U.S. dollar is the functional currency are included in our Statements of Operations as a component of miscellaneous income (expense). Exchange gains (losses) on foreign currency transactions were $0.2 million, $1.0 million, and $(1.5) million for fiscal 2012, 2011 and 2010, respectively.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Derivatives                                                                         | Derivatives:  The Company periodically enters into derivative contracts such as foreign currency forwards and interest rate swaps, which are designated as cash flow hedges. All derivatives are recognized on the balance sheet at their estimated fair value. On the date a derivative contract is entered into, the Company designates the derivative as a hedge of a recognized asset or liability (a “fair value” hedge), a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (a “cash flow” hedge), or a hedge of the net investment in a foreign operation. The Company does not enter into derivatives for speculative purposes. Changes in the fair value of a derivative that qualifies as a fair value hedge are recorded in earnings along with the gain or loss on the hedged asset or liability. Changes in the fair value of a derivative that qualifies as a cash flow hedge are recorded in “Accumulated other comprehensive income” within shareholders’ equity, until earnings are affected by the variability of cash flows. Changes in the fair value of a derivative used to hedge the net investment in a foreign operation are recorded in “Accumulated other comprehensive income” within shareholders’ equity. The Company's interest rate swaps and forward contracts are treated as cash flow hedges and, therefore, $6.8 million, $(0.4) million and $2.0 million were recorded in “Accumulated other comprehensive income” for fiscal 2012, 2011 and 2010, respectively.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Grants from Government Authorities [Policy Text Block]                              | Grants from Government Authorities:  Grants from governments are recognized at their fair value where there is reasonable assurance that the grant funds will be received and the Company will comply with all attached conditions to the grant. Government grants relating to property, plant and equipment are recorded as an offset to the carrying value of the related assets at the time of capitalization.  Government grants relating to other costs incurred are recognized as an offset to those related costs, for which the grants are intended to compensate for, at the time they are recognized.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Earnings Per Share                                                                  | Earnings Per Share:  The computation of basic earnings per common share is based upon the weighted average number of common shares outstanding and net income. The computation of diluted earnings per common share reflects additional dilution from stock options and restricted stock, excluding any with an antidilutive effect.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Stock-Based Compensation                                                            | Stock-based Compensation:  The Company measures all share-based payments to employees, including grants of employee stock options, at fair value and expenses them in the Consolidated Statements of Operations over the service period (generally the vesting period) of the grant.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Comprehensive Income                                                                | Comprehensive Income:  The Company follows the established standards for reporting comprehensive income, which is defined as the changes in equity of an enterprise except those resulting from shareholder transactions.Accumulated other comprehensive income consists of the following as of September 29, 2012 and October 1, 2011 (in thousands):   2012 2011Foreign currency translation adjustments $12,694 $11,460Cumulative change in fair market value of derivative instruments, net of tax 3,490 (3,331)Accumulated other comprehensive income $16,184 $8,129The change in fair market value of derivative instruments, net of tax adjustment that is recorded to “Accumulated other comprehensive income” is more fully explained in Note 6, "Derivatives and Fair Value Measurements."                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Conditional Asset Retirement Obligations                                            | Conditional Asset Retirement Obligations:  The Company recognizes a liability for the fair value of a conditional asset retirement obligation if the fair value can be reasonably estimated even though uncertainty exists about the timing and/or method of settlement. The liability is adjusted for any additions or deletions of related property, plant and equipment.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Use Of Estimates                                                                    | Use of Estimates:  The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Fair Value Of Financial Instruments                                                 | Fair Value of Financial Instruments:  Accounts payable and accrued liabilities are reflected in the consolidated financial statements at cost because of the short-term duration of these instruments. Accounts receivable are reflected at net realizable value based on anticipated losses due to potentially uncollectible balances. Anticipated losses were based on management’s analysis of historical losses and changes in customers’ credit status. The fair value of capital lease obligations was approximately $13.7 million and $15.8 million as of September 29, 2012 and October 1, 2011, respectively. The fair value of the Company’s long-term debt was $256.8 million and $274.3 million as of September 29, 2012 and October 1, 2011, respectively.  The Company uses quoted market prices when available or discounted cash flows to calculate fair value.  If measured at fair value in the financial statements, long-term debt and capital lease obligations (including the current portion) would be classified as Level 2 in the fair value hierarchy described below.  The fair values of the Company’s derivatives are disclosed in Note 6, "Derivatives and Fair Value Measurements."  Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (or exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting guidance establishes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The input levels are:Level 1:  Quoted (observable) market prices in active markets for identical assets or liabilities.Level 2:  Inputs other than Level 1 that are observable, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.Level 3:  Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability. |
| Business And Credit Concentrations                                                  | Business and Credit Concentrations:  Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents, trade accounts receivable and derivative instruments, specifically related to counterparties. In accordance with the Company’s investment policy, the Company’s cash, cash equivalents and derivative instruments were placed with recognized financial institutions. The Company’s investment policy limits the amount of credit exposure in any one issue and the maturity date of the investment securities that typically comprise investment grade short-term debt instruments. Concentrations of credit risk in accounts receivable resulting from sales to major customers are discussed in Note 12, "Reportable Segments, Geographic Information and Major Customers."  The Company, at times, requires advanced cash deposits for services performed. The Company also closely monitors extensions of credit.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |

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| - Definition
Disclosure of accounting policy for determining amounts to accrue and charge against earnings so as to satisfy legal obligations associated with the retirement (through sale, abandonment, recycling, or disposal in some other manner) of a tangible long-lived asset that result from the acquisition, construction, or development and (or) the normal operation of a long-lived asset. This accounting policy disclosure excludes obligations arising 1) in connection with leased property, whether imposed by a lease agreement or by a party other than the lessor, that meet the definition of either minimum lease payments or contingent rentals; 2) solely from a plan to sell or otherwise dispose of a long-lived asset and 3) from certain environmental remediation liabilities.
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| - Definition
Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.
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Disclosure of accounting policy for its derivative instruments and hedging activities. Disclosure may include: (1) Each method used to account for derivative financial instruments and derivative commodity instruments ("derivatives"); (2) the types of derivatives accounted for under each method; (3) the criteria required to be met for each accounting method used, including a discussion of the criteria required to be met for hedge or deferral accounting and accrual or settlement accounting (for example, whether and how risk reduction, correlation, designation, and effectiveness tests are applied); (4) the accounting method used if the criteria specified for hedge accounting are not met; (5) the method used to account for termination of derivatives designated as hedges or derivatives used to affect directly or indirectly the terms, fair values, or cash flows of a designated item; (6) the method used to account for derivatives when the designated item matures, is sold, is extinguished, or is terminated. In addition, the method used to account for derivatives designated to an anticipated transaction, when the anticipated transaction is no longer likely to occur; and (7) where and when derivatives, and their related gains or losses are reported in the statement of financial position, cash flows, and results of operations and (8) an accounting policy decision to offset fair value amounts with counterparties. An entity may also describe its embedded derivatives, and the method(s) used to determine the fair values of derivatives and any significant assumptions used in such valuations.
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| - Definition
Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.
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| - Definition
Disclosure of accounting policy for determining the fair value of financial instruments.
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| - Definition
Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.
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| - Definition
Disclosure of accounting policy for recognizing and measuring the impairment of long-lived assets. An entity also may disclose its accounting policy for long-lived assets to be sold. This policy excludes goodwill and intangible assets.
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| - Definition
Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.
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| - Definition
Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory.
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| - Definition
The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.
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No definition available.
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| - Definition
Disclosure of accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.
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| - Definition
Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.
+ References
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| - Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
+ References
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