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Contract Termination And Restructuring Costs (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Contract termination costs $ 66,042 $ 61,469 $ 62,589
Restructuring charges     1,482
Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Profit sharing agreement, termination payment     1,500
US and Canada Direct Office Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Accrued costs 100 $ 100  
Fiscal 2017 Restructuring Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     3,600
Fiscal 2017 Restructuring Costs [Member] | Exit Japan Publishing Business [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     $ 2,100
Fiscal 2017 Restructuring Costs [Member] | US and Canada Direct Office Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 1,482    
License Agreement [Member] | Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
License agreement period     10 years
Royalty ratio, obligated     33.00%
Royalty ratio, excess of the contractual minimums     33.00%
Contract termination costs     $ 1,500
Minimum [Member] | License Agreement [Member] | Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Royalty payments     $ 13,000