| **Financial Instruments & Related Fair Value (Tables)**                     | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| **Financial Instruments And Related Fair Value Detail [Abstract]**              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis      | The following table sets forth, by level of the fair value hierarchy, our financial assets that were accounted for at fair value on a recurring basis as of October 31, 2015 and 2014.We have had no transfers between any level during the years ended October 31, 2015 and 2014.Recurring Fair Value Measurements as of October 31, 2015               Significant       Effects of    Quoted Prices     Other     Significant     Netting and    in Active     Observable     Unobservable     Cash Collateral Total      Markets     Inputs     Inputs     Receivables/ Carrying    In thousands     (Level 1)         (Level 2)         (Level 3)     Payables Value    Assets:          Derivatives held for distribution operations $1,343 $— $— $— $1,343Debt and equity securities held as trading securities:          Money markets 516 — — — 516Mutual funds 4,386 — — — 4,386  Total fair value assets $6,245 $— $— $— $6,245Recurring Fair Value Measurements as of  October 31, 2014               Significant       Effects of    Quoted Prices     Other     Significant     Netting and    in Active     Observable     Unobservable     Cash Collateral Total      Markets     Inputs     Inputs     Receivables/ Carrying    In thousands     (Level 1)         (Level 2)         (Level 3)     Payables Value    Assets:          Derivatives held for distribution operations $4,898 $— $— $— $4,898Debt and equity securities held as trading securities:         Money markets 469 — — — 469Mutual funds 3,472 — — — 3,472  Total fair value assets $8,839 $— $— $— $8,839 |
| Fair Value, by Balance Sheet Grouping                                           | The principal and fair value of our long-term debt, which is classified within Level 2, are shown below.In thousands Principal Fair ValueAs of October 31, 2015 $1,575,000 $1,720,586As of October 31, 2014 1,425,000 1,617,453The following table presents the fair value and balance sheet classification of our financial options for natural gas as of October 31, 2015 and 2014.Fair Value of Derivative Instruments     In thousands 2015 2014Derivatives Not Designated as Hedging Instruments under Derivative Accounting Standards:Asset Financial Instruments:    Current Assets - Gas purchase derivative assets (December 2015 - October 2016) $1,343  Current Assets - Gas purchase derivative assets (December 2014 - November 2015)   $4,898                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Amount Of Gain Loss Recognized On Derivatives And Deferred Under PGA Procedures | The following table presents the impact that financial instruments not designated as hedging instruments under derivative accounting standards would have had on the Consolidated Statements of Comprehensive Income for the twelve months ended October 31, 2015 and 2014, absent the regulatory treatment under our approved PGA procedures.  Amount of Amount of Location of Gain (Loss)  Gain (Loss) Recognized Gain (Loss) Deferred Recognized through  on Derivative Instruments Under PGA Procedures PGA Procedures         Twelve Months Ended     Twelve Months Ended        October 31     October 31      In thousands 2015 2014 2015 2014  Gas purchase options $(4,423) $6,162 $(4,423) $6,162 Cost of Gas                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

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| - Definition
Financial Instruments and Related Fair Value Detail [Abstract]
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No definition available.
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| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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| - Definition
Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.
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