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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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9 Months Ended |
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May 31, 2014
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Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expected volatility | 56.00% |
| Expected life (years) | 5 years |
| Interest rate, minimum | 1.10% |
| Interest rate, maximum | 2.10% |
| Weighted-average fair values | $ 6.53 |