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Share Repurchase Plans (Details) - USD ($)
$ in Thousands
9 Months Ended 15 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
Equity, Class of Treasury Stock [Line Items]      
Total cost of repurchased shares $ 24,691 $ 25,886  
2013 Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share buy-back plan, amount authorized   $ 60,000  
2014 Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share buy-back plan, amount authorized $ 75,000   $ 75,000
Share buy-back plan, number of shares repurchased     438,487
Total cost of repurchased shares     $ 40,400