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Share Repurchase Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Sep. 01, 2016
Equity, Class of Treasury Stock [Line Items]      
Total cost of repurchased shares $ 12,156 $ 8,075  
2016 To 2018 Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share buy-back plan, amount authorized     $ 75,000
Share buy-back plan, number of shares repurchased 112,701    
Total cost of repurchased shares $ 12,200