Share Repurchases (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Equity [Abstract]
Number of shares of common stock repurchased during the period	0	0	0	0
Remaining amount available under the repurchase program	$ 63.7		$ 63.7