New Accounting Guidance (Details) - USD ($) $ in Thousands	6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by investing activities	$ (389,608)	$ 755,881
Net cash used in operating activities	(107,765)	863,999
Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by investing activities	96,800	1,200,000
Net cash used in operating activities	$ 96,800	$ 1,200,000