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Treasury Stock (Details) - USD ($)
$ in Millions
3 Months Ended 13 Months Ended
Aug. 31, 2016
Aug. 31, 2016
Jul. 22, 2015
Equity, Class of Treasury Stock [Line Items]      
Increase in authorized amount of stock to be repurchased     $ 50.0
Treasury stock acquired $ 0.0 $ 4.5