Annual report pursuant to Section 13 and 15(d)

Summary of Weighted-Average Grant-Date Fair Value of Options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised (Detail)

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Summary of Weighted-Average Grant-Date Fair Value of Options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Weighted-average fair value of options granted (per share) $ 10.49 $ 8.73 $ 10.74
Intrinsic value gain of options exercised $ 15,803 $ 7,946 $ 7,540
Cash receipts from exercise of options $ 24,840 $ 6,550 $ 4,324