New Accounting Guidance (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by investing activities	$ (131,252)	$ 300,846
Net cash used in operating activities	91,693	649,645
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by investing activities	96,800	596,100
Net cash used in operating activities	$ 96,800	$ 596,100