Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Aug. 31, 2022	Aug. 31, 2021
Deferred tax assets:
Accrued expenses	$ 61,843	$ 57,245
Postretirement health care and deferred compensation	46,008	42,217
Tax credit carryforwards	101,457	128,824
Loss carryforwards	110,018	115,327
Nonqualified equity	424,869	391,309
Deferred tax asset lease obligation	60,329	62,770
Other	95,027	92,325
Deferred tax assets valuation allowance	(189,685)	(208,810)
Total deferred tax assets	709,866	681,207
Deferred tax liabilities:
Pension costs	14,600	24,277
Investments	169,970	110,910
Property, plant and equipment	605,463	557,129
Deferred tax liability right of use asset	58,852	61,870
Other	0	28,549
Total deferred tax liabilities	848,885	782,735
Deferred Tax Liabilities, Net	$ 139,019	$ 101,528