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Earnings Per Share - Additional Information (Detail) (Stock Options [Member])
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3 Months Ended | |
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Nov. 30, 2012
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Nov. 30, 2011
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Stock Options [Member]
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| Earnings Per Share [Line Items] | ||
| Antidilutive weighted-average stock options excluded from the calculation of diluted earnings (loss) per share | 957,446 | 1,309,499 |