| **Consolidated Balance Sheets - USD ($) $ in Thousands**                                                                    | Oct. 31, 2015 | Oct. 31, 2014 |
|-----------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Utility Plant:**                                                                                                          |               |          |   |
| Utility plant in service                                                                                                    |               | $ 5,426,584   | $ 5,011,497 |
| Less accumulated depreciation                                                                                               |               | 1,251,940     | 1,166,922 |
| Utility plant in service, net                                                                                               |               | 4,174,644     | 3,844,575 |
| Construction work in progress                                                                                               |               | 170,250       | 141,693 |
| Plant held for future use                                                                                                   |               | 3,155         | 3,155 |
| Total utility plant, net                                                                                                    |               | 4,348,049     | 3,989,423 |
| Other Physical Property, at cost (net of accumulated depreciation of $926 in 2015 and $904 in 2014)                         |               | 332           | 355 |
| **Current Assets:**                                                                                                         |               |          |   |
| Cash and cash equivalents                                                                                                   |               | 13,744        | 9,643 |
| Trade accounts receivable (1) (less allowance for doubtful accounts of $1,648 in 2015 and $2,152 in 2014)                   | [1]           | 59,248        | 65,260 |
| Income taxes receivable                                                                                                     |               | 11,447        | 36,100 |
| Other receivables                                                                                                           |               | 10,667        | 3,361 |
| Unbilled utility revenues                                                                                                   |               | 17,422        | 21,093 |
| **Inventories:**                                                                                                            |               |          |   |
| Gas in storage                                                                                                              |               | 68,240        | 84,081 |
| Materials, supplies and merchandise                                                                                         |               | 1,251         | 1,652 |
| Gas purchase derivative assets, at fair value                                                                               |               | 1,343         | 4,898 |
| Regulatory assets                                                                                                           |               | 10,936        | 27,837 |
| Prepayments                                                                                                                 |               | 28,903        | 39,030 |
| Deferred income taxes                                                                                                       |               | 32,392        | 53,418 |
| Other current assets                                                                                                        |               | 344           | 326 |
| Total current assets                                                                                                        |               | 255,937       | 346,699 |
| **Noncurrent Assets:**                                                                                                      |               |          |   |
| Equity method investments in non-utility activities                                                                         |               | 206,956       | 170,171 |
| Goodwill                                                                                                                    |               | 48,852        | 48,852 |
| Regulatory assets                                                                                                           |               | 196,726       | 174,281 |
| Income taxes receivable                                                                                                     |               | 26,023        | 0 |
| Marketable securities, at fair value                                                                                        |               | 4,666         | 3,727 |
| Overfunded postretirement asset                                                                                             |               | 17,770        | 33,757 |
| Other noncurrent assets                                                                                                     |               | 5,439         | 7,042 |
| Total noncurrent assets                                                                                                     |               | 506,432       | 437,830 |
| Total                                                                                                                       |               | 5,110,750     | 4,774,307 |
| **Stockholders’ equity:**                                                                                             |               |          |   |
| Cumulative preferred stock - no par value - 175 shares authorized                                                           |               | 0             | 0 |
| Common stock – no par value – shares authorized: 200,000; shares outstanding: 80,883 in 2015 and 78,531 in 2014 |               | 721,419       | 636,835 |
| Retained earnings                                                                                                           |               | 705,748       | 672,004 |
| Accumulated other comprehensive loss                                                                                        |               | (855)         | (237) |
| Total stockholders’ equity                                                                                            |               | 1,426,312     | 1,308,602 |
| Long-term debt, net                                                                                                         |               | 1,523,677     | 1,414,484 |
| Total capitalization                                                                                                        |               | 2,949,989     | 2,723,086 |
| **Current Liabilities:**                                                                                                    |               |          |   |
| Current maturities of long-term debt                                                                                        |               | 40,000        | 0 |
| Short-term debt                                                                                                             |               | 340,000       | 355,000 |
| Trade accounts payable (1)                                                                                                  | [1]           | 99,895        | 85,299 |
| Other accounts payable                                                                                                      |               | 52,149        | 54,349 |
| Accrued interest                                                                                                            |               | 29,488        | 27,982 |
| Customers’ deposits                                                                                                   |               | 20,896        | 19,994 |
| General taxes accrued                                                                                                       |               | 27,940        | 23,828 |
| Regulatory liabilities                                                                                                      |               | 13,367        | 46,231 |
| Other current liabilities                                                                                                   |               | 11,861        | 9,303 |
| Total current liabilities                                                                                                   |               | 635,596       | 621,986 |
| **Noncurrent Liabilities:**                                                                                                 |               |          |   |
| Deferred income taxes                                                                                                       |               | 861,615       | 809,467 |
| Unamortized federal investment tax credits                                                                                  |               | 1,027         | 1,193 |
| Accumulated provision for postretirement benefits                                                                           |               | 14,975        | 15,471 |
| Regulatory liabilities                                                                                                      |               | 590,301       | 558,598 |
| Conditional cost of removal obligations                                                                                     |               | 19,712        | 14,647 |
| Other noncurrent liabilities                                                                                                |               | 37,535        | 29,859 |
| Total noncurrent liabilities                                                                                                |               | $ 1,525,165   | $ 1,429,235 |
| Commitments and Contingencies                                                                                               |               |               |  |
| Total                                                                                                                       |               | $ 5,110,750   | $ 4,774,307 |
|                                                                                                                             |
| [1]See Note 13 for amounts attributable to affiliates.                                                                      |

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| - Definition
Period end net book value of property, plant and equipment (PPE) that is in service and owned by the regulated operations of the public utility
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Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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| - Definition
The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life.
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| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.
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| - Definition
This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument.
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.
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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.
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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.
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| - Definition
Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, netted by jurisdiction and classified as noncurrent.
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| - Definition
The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.
+ References
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| - Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
+ References
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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| - Definition
Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.
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| - Definition
Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.
+ References
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| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - References
No definition available.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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| - Definition
Amount of obligation due after one year or beyond the normal operating cycle, if longer.
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| - References
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| - Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.
+ References
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
+ References
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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| - Definition
Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer.
+ References
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| - Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
+ References
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| - Definition
Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.
+ References
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| - Definition
This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement and postemployment benefit plans.
+ References
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| - Definition
Discloses the period end amount of plants held for future use and whether such amount is included in the utility's rate base.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
+ References
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| - Definition
Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.
+ References
No definition available.
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| - Definition
Period end amount of construction work in progress in public utility.
+ References
No definition available.
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| - Definition
Period end amount of total net PPE.
+ References
No definition available.
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No definition available.
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| - Definition
Period end amount of total gross PPE.
+ References
No definition available.
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| - Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.
+ References
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| - Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.
+ References
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| - Definition
The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.
+ References
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| - Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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| - References
No definition available.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.
+ References
No definition available.
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