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Other Assets - Rollforward of Capitalized Maintenance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Capitalized Maintenance Expense [Roll Forward]
Balance at Beginning of Year	$ 228,511	$ 286,890	$ 130,780
Cost Deferred	41,899	14,496	224,406
Amortization	(73,769)	(72,875)	(68,296)
Balance at End of Year	$ 196,641	$ 228,511	$ 286,890