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Accumulated Other Comprehensive Income (Loss) ("AOCI") - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
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9 Months Ended |
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May 31, 2014
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May 31, 2013
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| Accumulated Other Comprehensive Income (Loss) [Line Items] |
|
|
| Beginning Balances |
$ (7,619) |
$ (15,593) |
| Other comprehensive income (loss) before reclassification adjustments, net of tax |
(3,207) |
239 |
| Amounts reclassified from Accumulated other comprehensive income (loss), net of tax |
6,068 |
(1,426) |
| Ending Balances |
(4,758) |
(16,780) |
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Cash Flow Hedging Instruments [Member]
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|
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| Accumulated Other Comprehensive Income (Loss) [Line Items] |
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| Beginning Balances |
(856) |
1,638 |
| Other comprehensive income (loss) before reclassification adjustments, net of tax |
(5,912) |
239 |
| Amounts reclassified from Accumulated other comprehensive income (loss), net of tax |
5,842 |
(2,490) |
| Ending Balances |
(926) |
(613) |
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Postretirement Obligations [Member]
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|
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| Accumulated Other Comprehensive Income (Loss) [Line Items] |
|
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| Beginning Balances |
(6,763) |
(17,231) |
| Other comprehensive income (loss) before reclassification adjustments, net of tax |
2,705 |
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| Amounts reclassified from Accumulated other comprehensive income (loss), net of tax |
226 |
1,064 |
| Ending Balances |
$ (3,832) |
$ (16,167) |