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Stock-based Compensation - Stock Options Awards (Details) - Employee Stock Option - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Number of Stock Options Outstanding      
Outstanding at the beginning of the period (in shares) 22 32  
Forfeited (in shares) (8) (10)  
Outstanding at the end of the period (in shares) 14 22 32
Vested and expected to vest at the end of the period (in shares) 14    
Exercisable at the end of the period (in shares) 14    
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 107.14 $ 94.62  
Forfeited (in dollars per share) 106.69 65.66  
Outstanding at the end of the period (in dollars per share) 107.40 $ 107.14 $ 94.62
Vested and expected to vest at the end of the period (in dollars per share) 107.40    
Exercisable at the end of the period (in dollars per share) $ 107.40    
Weighted-Average Remaining Contractual Life      
Outstanding balance 3 years 7 months 6 days 4 years 1 month 6 days 4 years 6 months
Vested and expected to vest at the end of the period 3 years 7 months 6 days    
Exercisable at the end of the period 3 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding at the beginning of the period   $ 8  
Outstanding at the end of the period $ 1   $ 8
Vested and expected to vest at the end of the period 1    
Exercisable at the end of the period 1    
Additional information on stock options      
Unrecognized compensation cost related to unvested stock options $ 0