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Stock-Based Compensation - Schedule of Share Based Payment Award Stock Options Valuation Assumptions (Detail) (Stock Options [Member], USD $)
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3 Months Ended |
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Nov. 30, 2012
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Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expected volatility | 67.00% |
| Expected life (years) | 5 years |
| Interest rate, Minimum | 0.60% |
| Interest rate, Maximum | 1.00% |
| Weighted-average fair values (in USD per share) | $ 4.20 |