Other Assets - Rollforward of Capitalized Maintenance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Capitalized Maintenance Expense [Roll Forward]
Balance at Beginning of Year	$ 196,641	$ 228,511	$ 286,890
Cost Deferred	25,401	41,899	14,496
Amortization	(74,521)	(73,769)	(72,875)
Balance at End of Year	$ 147,521	$ 196,641	$ 228,511