| **Comprehensive Income (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated other comprehensive income (loss), net of tax [Abstract]**           |           |           |   |   |   |
| Pension costs                                                                      | $ 552,895      | $ 575,163      |   | $ 552,895 |   |
| Postretirement costs                                                               | 43,709         | 41,811         |   | 43,709 |   |
| Deferred taxes on pension and OPEB costs                                           | (221,931)      | (230,161)      |   | (221,931) |   |
| All other                                                                          | 148            | 150            |   | 148 |   |
| Accumulated other comprehensive loss, net of tax                                   | 374,821        | 386,963        |   | 374,821 |   |
| **Other comprehensive income (loss), Before-Tax Amount [Abstract]**                |           |           |   |   |   |
| Amortization of pension and postretirement costs                                   | 6,080          |           | 3,334 | 20,370 | 10,003 |
| All other                                                                          |           |           |   | 0 | (480) |
| Other comprehensive income (loss)                                                  |           |           |   | 20,370 | 9,523 |
| **Other comprehensive income (loss), Tax Expense/(Benefit) [Abstract]**            |           |           |   |   |   |
| Amortization of pension and postretirement costs                                   | 3,772          |           | 0 | 8,228 | 1,199 |
| All other                                                                          |           |           |   | 0 | 0 |
| Other comprehensive income (loss)                                                  |           |           |   | 8,228 | 1,199 |
| **Other comprehensive income (loss), Net-of-Tax Amount [Abstract]**                |           |           |   |   |   |
| Amortization of pension and postretirement costs                                   | 2,308          |           | 3,334 | 12,142 | 8,804 |
| All other                                                                          |           |           |   | 0 | (480) |
| Other comprehensive income (loss)                                                  | $ 2,308        | $ (165,738)    | $ 3,334 | $ 12,142 | $ 8,324 |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated other comprehensive loss related to all other items not otherwise specified in the taxonomy. The amount represented by this item is net of tax, as applicable.
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No definition available.
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| - Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension plan because they have yet to be recognized as components of net periodic benefit cost.
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| - Definition
The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with other postretirement benefit plan(s) because they have yet to be recognized as components of net periodic benefit cost.
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| - Definition
Pre tax change in other comprehensive income (loss) from all other items not otherwise specified in the taxonomy.
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Net of tax change in other comprehensive income (loss) from all other items not otherwise specified in the taxonomy.
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Tax effect in other comprehensive income (loss) from all other items not otherwise specified in the taxonomy.
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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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses in other comprehensive income.
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| - Definition
Net of tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.
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| - Definition
Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.
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| - Definition
Before tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
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| - Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
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| - Definition
Before tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.
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| - Definition
Tax effect of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
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