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Shareholders' Equity (Narrative) (Details) - USD ($)
12 Months Ended
Mar. 27, 2015
Jan. 23, 2015
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Class of Stock [Line Items]            
Shares of preferred stock authorized for issuance     14,000,000      
Preferred stock issued     0 0    
Preferred stock outstanding     0 0    
Amount authorized under common stock repurchase plan $ 40,000,000          
Number of shares withheld for minimum statutory taxes     561 104,699 51,156  
Values of withheld shares     $ 12,000 $ 2,000,000 $ 900,000  
Stock repurchased during period, shares   10,000,000 1,539,828      
Stock repurchased during period, value     $ 26,800,000      
Cash and cash equivalents 10,000,000   $ 27,699,000 $ 10,153,000 $ 8,924,000 $ 10,456,000
Minimum [Member]            
Class of Stock [Line Items]            
Available cash for debt financing $ 10,000,000