Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2020	Aug. 31, 2021
Deferred income tax assets:
Deferred Tax Assets Operating Loss And Tax Credit Carryforwards	$ 78,717		$ 77,691
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	6,002		6,110
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	5,995		8,364
Deferred Tax Assets, Inventory	2,780		3,177
Deferred Tax Assets, Lease Liabilities	9,637		11,609
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	9,873		11,471
Total deferred income tax assets	113,004		118,422
Valuation allowance	(61,630)		(66,155)
Net deferred income tax assets	51,374		52,267
Deferred income tax liabilities:
Depreciation and amortization	(30,149)		(29,444)
Deferred Tax Liabilities Lease Assets	(9,637)		(11,609)
Other items	(1,024)		(781)
Deferred income tax liabilities	(40,810)		(41,834)
Net deferred income tax liability	(10,564)		(10,433)
Income Tax Disclosure Additional Details [Table] [Line Items]
Deferred Tax Liabilities, Other	1,024		781
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	6,700
Deferred Tax Assets, Tax Credit Carryforwards	2,500
Deferred Tax Assets, Tax Credit Carryforwards, Other			2,500
Net Benefit, Taxable Liquidations of Foreign Subsidiaries	(2,700)	$ 4,100
Other Noncurrent Assets [Member]
Deferred income tax liabilities:
Deferred Income Tax Assets, Net	17,900		14,800
Deferred income taxes [Member]
Deferred income tax liabilities:
Deferred Income Tax Liabilities, Net	$ 7,300		$ 4,400