| **Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands**                                                                                                                                                                  | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Statement of Comprehensive Income [Abstract]**                                                                                                                                                                                                                                                        |                |           |   |   |   |
| Operating Revenues (1)                                                                                                                                                                                                                                                                                  | [1]            | $ 157,806      | $ 158,266 | $ 969,329 | $ 1,190,462 |
| Cost of Gas (1)                                                                                                                                                                                                                                                                                         | [1]            | 43,035         | 46,694 | 343,944 | 583,199 |
| Margin                                                                                                                                                                                                                                                                                                  |                | 114,771        | 111,572 | 625,385 | 607,263 |
| **Operating Expenses:**                                                                                                                                                                                                                                                                                 |                |           |   |   |   |
| Operations and maintenance                                                                                                                                                                                                                                                                              |                | 68,867         | 69,587 | 215,675 | 207,162 |
| Depreciation                                                                                                                                                                                                                                                                                            |                | 34,485         | 32,317 | 102,215 | 95,900 |
| General taxes                                                                                                                                                                                                                                                                                           |                | 11,103         | 11,532 | 31,908 | 32,504 |
| Utility income taxes                                                                                                                                                                                                                                                                                    |                | (6,339)        | (7,097) | 87,660 | 85,583 |
| Total operating expenses                                                                                                                                                                                                                                                                                |                | 108,116        | 106,339 | 437,458 | 421,149 |
| Operating Income                                                                                                                                                                                                                                                                                        |                | 6,655          | 5,233 | 187,927 | 186,114 |
| **Other Income (Expense):**                                                                                                                                                                                                                                                                             |                |           |   |   |   |
| Income from equity method investments                                                                                                                                                                                                                                                                   |                | 4,238          | 5,801 | 28,025 | 29,908 |
| Non-operating income                                                                                                                                                                                                                                                                                    |                | 708            | 673 | 1,973 | 1,934 |
| Non-operating expense                                                                                                                                                                                                                                                                                   |                | (734)          | (1,196) | (2,972) | (3,093) |
| Income taxes                                                                                                                                                                                                                                                                                            |                | (1,876)        | (2,097) | (11,089) | (11,277) |
| Total other income (expense)                                                                                                                                                                                                                                                                            |                | 2,336          | 3,181 | 15,937 | 17,472 |
| **Utility Interest Charges:**                                                                                                                                                                                                                                                                           |                |           |   |   |   |
| Interest on long-term debt                                                                                                                                                                                                                                                                              |                | 18,783         | 17,483 | 56,445 | 52,432 |
| Allowance for borrowed funds used during construction                                                                                                                                                                                                                                                   |                | (3,819)        | (2,859) | (9,917) | (7,935) |
| Other                                                                                                                                                                                                                                                                                                   |                | 757            | 2,050 | 2,844 | 7,969 |
| Total utility interest charges                                                                                                                                                                                                                                                                          |                | 15,721         | 16,674 | 49,372 | 52,466 |
| Net Income (Loss)                                                                                                                                                                                                                                                                                       |                | (6,730)        | (8,260) | 154,492 | 151,120 |
| **Other Comprehensive Income (Loss), net of tax:**                                                                                                                                                                                                                                                      |                |           |   |   |   |
| Unrealized gain (loss) from hedging activities of equity method investments, net of tax of $79 and $13 for the three months ended July 31, 2016 and 2015, respectively, and ($214) and ($787) for the nine months ended July 31, 2016 and 2015, respectively                                            |                | 102            | 33 | (360) | (1,227) |
| Reclassification adjustment of realized loss from hedging activities of equity method investments included in net income, net of tax of $124 and $198 for the three months ended July 31, 2016 and 2015, respectively, and $557 and $558 for the nine months ended July 31, 2016 and 2015, respectively |                | 206            | 307 | 881 | 872 |
| Net current period benefit activities of equity method investments, net of tax of ($7) and $1 for the three months ended July 31, 2016 and 2015, respectively, and ($5) and ($24) for the nine months ended July 31, 2016 and 2015, respectively                                                        |                | (12)           | 2 | (10) | (36) |
| Total other comprehensive income (loss)                                                                                                                                                                                                                                                                 |                | 296            | 342 | 511 | (391) |
| Comprehensive Income (Loss)                                                                                                                                                                                                                                                                             |                | $ (6,434)      | $ (7,918) | $ 155,003 | $ 150,729 |
| **Average Shares of Common Stock:**                                                                                                                                                                                                                                                                     |                |           |   |   |   |
| Basic (in shares)                                                                                                                                                                                                                                                                                       |                | 81,214         | 79,039 | 81,095 | 78,826 |
| Diluted (in shares)                                                                                                                                                                                                                                                                                     |                | 81,214         | 79,039 | 81,392 | 79,175 |
| **Earnings (Loss) Per Share of Common Stock:**                                                                                                                                                                                                                                                          |                |           |   |   |   |
| Basic (usd per share)                                                                                                                                                                                                                                                                                   |                | $ (0.08)       | $ (0.10) | $ 1.91 | $ 1.92 |
| Diluted (usd per share)                                                                                                                                                                                                                                                                                 |                | $ (0.08)       | $ (0.10) | $ 1.90 | $ 1.91 |
|                                                                                                                                                                                                                                                                                                         |
| [1]See Note 13 for amounts attributable to affiliates.                                                                                                                                                                                                                                                  |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of non-utility taxable income (loss) from continuing operations.
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The component of income tax expense for the period representing amounts of income taxes paid or payable as determined by applying the provisions for relevant enacted tax laws to relevant amounts of utility taxable income (loss).
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
Amount after tax and reclassification adjustments, of accumulated other comprehensive gain (loss) related to pension and other postretirement defined benefit plans attributable to an entity's share of an equity investee's gain (loss).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
Aggregate amount of interest paid or due on all long-term debt.
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| - Definition
Amount of interest expense classified as other.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
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The net result for the period of deducting operating expenses from operating revenues.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of other comprehensive income (loss) attributable to parent entity.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount of expense related to nonoperating activities, classified as other.
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Amount of income related to nonoperating activities, classified as other.
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| - Definition
Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments.
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| - Definition
The total amount of operating revenues recognized during the period.
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Amount of operating expense of regulated operation.
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Amount of operating expense for depreciation and amortization of regulated operation.
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| - Definition
Amount of operating expense for purchased gas and petroleum of regulated operation.
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Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation.
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| - Definition
Amount of operating expense for taxes other than income taxes of regulated operation.
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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