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Pension and Postretirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 28, 2014
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Feb. 28, 2013
|
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| Defined Benefit Pension Plan Disclosure [Line Items] | ||||
| Curtailment (gain) loss | $ 0 | $ 0 | $ 0 | $ 333 |
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Pension Plans, Defined Benefit [Member]
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| Defined Benefit Pension Plan Disclosure [Line Items] | ||||
| Service cost | 960 | 988 | 1,908 | 1,954 |
| Interest cost | 1,355 | 1,222 | 2,689 | 2,423 |
| Expected return on plan assets | (455) | (376) | (899) | (753) |
| Actuarial loss (gain) and amortization of prior service cost (credit), net | 355 | 378 | 704 | 748 |
| Net periodic benefit cost | 2,215 | 2,212 | 4,402 | 4,372 |
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Other Postretirement Benefit Plans, Defined Benefit [Member]
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| Defined Benefit Pension Plan Disclosure [Line Items] | ||||
| Service cost | 1 | 3 | 2 | 8 |
| Interest cost | 123 | 112 | 246 | 227 |
| Actuarial loss (gain) and amortization of prior service cost (credit), net | (141) | (136) | (280) | (270) |
| Curtailment (gain) loss | 0 | 0 | 0 | 333 |
| Net periodic benefit cost | $ (17) | $ (21) | $ (32) | $ 298 |