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Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	Sep. 01, 2018	Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Overall decrease to revenues	$ (6,483,539)	$ (6,980,153)	$ (14,967,828)	$ (15,012,037)
Contract liabilities	560,400		560,400			$ 167,200
Revenue recognized	45,800		130,100
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of adoption for all contracts and customers that had not been completed as of the adoption date					$ 1,000
Overall decrease to revenues	(2,299,273)		(5,522,859)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Overall decrease to revenues	$ 9,600		$ 22,600

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