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Stock-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Detail) (USD $)
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3 Months Ended |
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3 Months Ended |
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Nov. 30, 2012
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Aug. 31, 2012
Outstanding Beginning Balance Option Price Range [Member]
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Nov. 30, 2012
Granted During Period Option Price Range [Member]
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Nov. 30, 2012
Cancelled During Period Option Price Range [Member]
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Nov. 30, 2012
Outstanding Ending Balance Option Price Range [Member]
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Nov. 30, 2012
Exercisable Ending Balance Option Price Range [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding, beginning of period, Shares |
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1,824,916 |
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| Options outstanding, end of period, Shares |
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1,824,916 |
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1,801,725 |
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| Shares, Granted |
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25,000 |
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| Weighted-Average Exercise Price, Options Outstanding end of period (in USD per share) |
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$ 10.94 |
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$ 10.82 |
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| Shares, Exercised |
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| Shares, Cancelled |
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(48,191) |
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| Options exercisable, end of period, Shares |
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1,005,225 |
| Weighted-Average Exercise Price, Options Outstanding beginning of period (in USD per share) |
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$ 10.94 |
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| Weighted-Average Exercise Price, Granted (in USD per share) |
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$ 7.60 |
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| Weighted-Average Exercise Price, Exercised (in USD per share) |
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| Weighted-Average Exercise Price, Cancelled (in USD per share) |
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$ 13.92 |
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| Weighted-Average Exercise Price, Options Exercisable, end of period (in USD per share) |
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$ 14.90 |
| Weighted Average Remaining Term, Outstanding, Ending Balance (in years) |
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3 years 10 months 10 days |
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| Weighted Average Remaining Term, Options Exercisable (in years) |
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2 years 18 days |
| Aggregate Intrinsic value, Outstanding, Ending Balance |
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$ 1,394,000 |
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| Aggregate Intrinsic value, Options Exercisable |
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$ 50,300 |