| **Summary Of Significant Accounting Policies (Tables)**                        | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Accounting Policies [Abstract]**                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Regulatory Assets                                                  | In thousandsJanuary 31, 2015 October 31, 2014Regulatory Assets:   Current:   Unamortized debt expense$1,516 $1,490Amounts due from customers338 16,108Environmental costs1,554 1,568Deferred operations and maintenance expenses916 916Deferred pipeline integrity expenses3,470 3,470Deferred pension and other retirement benefit costs2,757 2,769Robeson liquefied natural gas (LNG) development costs783 917Other1,261 1,850Total current12,595 29,088Noncurrent:   Unamortized debt expense15,004 15,402Environmental costs6,091 6,470Deferred operations and maintenance expenses4,528 4,721Deferred pipeline integrity expenses25,407 24,694Deferred pension and other retirement benefit costs19,929 18,799Amounts not yet recognized as a component of pension and other retirement benefit costs92,676 94,265Regulatory cost of removal asset18,509 18,275Robeson LNG development costs413 509Other1,535 1,644Total noncurrent184,092 184,779Total$196,687 $213,867                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Schedule of Regulatory Liabilities                                             | Regulatory Liabilities:   Current:   Amounts due to customers$77,402 $46,231Noncurrent:   Regulatory cost of removal obligations510,940 506,574Deferred income taxes57,131 51,930Amounts not yet recognized as a component of pension and other retirement benefit costs92 94Total noncurrent568,163 558,598Total$645,565 $604,829                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Schedule of New Accounting Pronouncements and Changes in Accounting Principles | Accounting Guidance Adopted in First Quarter Fiscal Year 2015GuidanceDescriptionEffective dateEffect on the financial statements or other significant mattersASU 2013-11, July 2013, Income Taxes - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (Topic740)The guidance provides that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except under certain circumstances outlined in the update.Annual periods beginning after December 15, 2013, and interim periods within those periods, with early adoption permitted. We adopted the guidance effective November 1, 2014.The adoption had no impact on our financial position, results of operations or cash flows.Recently Issued Accounting GuidanceGuidanceDescriptionEffective dateEffect on the financial statements or other significant mattersASU 2014-09, May 2014, Revenue from Contracts with Customers (Topic 606)Under the new standard, entities will recognize revenue to depict the transfer of goods and services to customers in amounts that reflect the payment to which the entity expects to be entitled in exchange for those goods or services. The disclosure requirements will provide information about the nature, amount, timing and uncertainty of revenue and cash flows from an entity’s contracts with customers.Annual periods beginning after December 15, 2016, and interim periods within those periods. The Financial Accounting Standards Board (FASB) is considering a possible deferral of the effective date in the second quarter of 2015.We are currently evaluating the effect on our financial position, results of operations and cash flows. The evaluation includes identifying revenue streams by like contracts to allow for ease of implementation. In our evaluation, we are following the efforts of an accounting utility subgroup and its issuance of a revenue implementation guide.ASU 2014-15, August 2014, Presentation of Financial Statements - Going Concern (Subtopic 205-40)The FASB issued accounting guidance on determining when and how reporting entities must disclose going concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity's ability to continue as a going concern within one year of the date of issuance of the entity's financial statements. An entity must provide certain disclosures if there is a "substantial doubt about the entity's ability to continue as a going concern."Annual periods ending after December 15, 2016, and interim and annual periods thereafter; early adoption is permitted.The adoption of this guidance will have no impact on our financial position, results of operations or cash flows. It will require establishing a going concern assessment process to meet the standard.ASU 2015-01, January 2015, Income Statement - Extraordinary and Unusual Items (Subtopic 225-20)The FASB issued accounting guidance eliminating the concept of extraordinary items, thus eliminating the need to assess whether a particular event or transaction event is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring, with the amendments being applicable either prospectively or retrospectively, to all prior periods presented in the financial statements.Annual periods ending after December 15, 2015, and interim periods within those periods, with early adoption permitted, provided that the guidance is applied from the beginning of the fiscal year of adoption.The adoption of this guidance will be applied on a prospective basis. We have not had any extraordinary or unusual items that would impact our financial position, results of operations or cash flows. |

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| - Definition
Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.
+ References
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| - Definition
Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet.
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| - Definition
Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability.
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