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Pensions and Other Postretirement Benefits - Components of Accumulated Other Comprehensive Loss Unrecognized (Detail) (USD $)
In Thousands, unless otherwise specified |
Aug. 31, 2012
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Aug. 31, 2011
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|---|---|---|
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Pension Benefits [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Unrecognized prior service cost (credit) | $ 1,529 | $ 1,545 |
| Unrecognized net actuarial loss | 22,976 | 11,545 |
| Total | 24,505 | 13,090 |
|
Other Benefits [Member]
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||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Unrecognized prior service cost (credit) | (307) | (459) |
| Unrecognized net actuarial loss | 3,594 | 740 |
| Total | $ 3,287 | $ 281 |