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Earnings per share	9 Months Ended
Earnings per share	May 31, 2017
Earnings Per Share [Abstract]
Earnings per share	Earnings per share The dilutive effect of outstanding stock options on earnings per share is calculated using the treasury stock method. Stock options are anti-dilutive and excluded from the earnings per share calculation if the exercise price exceeds the average market price of the common shares. There were 6.4 million outstanding options to purchase common shares that were anti-dilutive and excluded from the third quarter earnings per share calculation as of May 31, 2017 compared to 2.8 million as of May 31, 2016. Anti-dilutive shares excluded from the year to date earnings per share calculation were 5.7 million compared to 2.4 million for the periods ended May 31, 2017 and May 31, 2016, respectively.