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Share Repurchases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Jul. 22, 2015
Jan. 03, 2014
Share Repurchases [Abstract]        
Repurchase authorization amount       $ 150,000
Increase in share repurchase authorization     $ 100,000  
Number of shares of common stock repurchased during the period 1,198,089 497,899    
Aggregate purchase price of shares repurchased $ 96,883 $ 41,059    
Remaining amount available under the repurchase program $ 112,100