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Stockholders' Equity (Recognized Stock-Based Compensation) (Details 1) - USD ($)
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Stockholders' Equity [Abstract]      
Restricted stock and stock appreciation rights ("SARS") $ 42,122,000 $ 52,459,000 $ 58,033,000
Employee stock purchase plan 6,334,000 6,538,000 4,717,000
Other 88,000   (187,000)
Total $ 48,544,000 $ 58,997,000 $ 62,563,000