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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
Aug. 31, 2012
|
Aug. 31, 2011
|
|---|---|---|
| Deferred tax assets: | ||
| Alternative minimum tax credit | $ 3,354 | $ 3,108 |
| Postretirement benefits | 18,060 | 12,377 |
| Provisions for accrued expenses | 2,908 | 1,893 |
| Stock-based compensation | 2,420 | 2,357 |
| Deferred flood losses | 2,625 | |
| Net operating loss carryforward | 7,469 | 8,242 |
| Tax credit carryforwards | 4,152 | 4,325 |
| Other | 2,025 | 2,935 |
| Total deferred tax assets gross | 40,388 | 37,862 |
| Less-valuation allowance | (1,787) | |
| Total deferred tax assets | 38,601 | 37,862 |
| Deferred tax liabilities: | ||
| Depreciation | 21,762 | 21,678 |
| Hedging | 1,004 | 448 |
| Other | 2,560 | 2,132 |
| Total deferred tax liabilities | 25,326 | 24,258 |
| Net deferred tax assets | 13,275 | 13,604 |
| Recognized as: | ||
| Other current assets | 167 | 909 |
| Deferred tax asset | 13,108 | 12,695 |
| Total net deferred tax assets | $ 13,275 | $ 13,604 |