Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($)	3 Months Ended	9 Months Ended
	May 31, 2020	May 31, 2020	May 31, 2019	Aug. 31, 2019
Equity [Abstract]
Treasury Stock, Shares	22,799,230	22,799,230		21,455,568
Stock Repurchase Program, Authorized Amount	$ 667,700,000	$ 667,700,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	5,200,770	5,200,770
Stock Repurchased During Period, Shares	503,873	1,343,662
Stock Repurchases	$ (9,700,000)	$ (27,520,000)	$ 0