Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Aug. 31, 2026	Aug. 31, 2025
Deferred income tax assets:
Deferred Tax Assets Operating Loss And Tax Credit Carryforwards	$ 31,200	$ 37,500
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	5,600	4,800
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	2,100	3,200
Deferred Tax Assets, Inventory	600	800
Deferred Tax Assets, Lease Liabilities	9,600	9,400
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	7,500	6,800
Total deferred income tax assets	64,500	73,100
Valuation allowance	(23,400)	(27,700)
Net deferred income tax assets	41,100	45,400
Deferred income tax liabilities:
Depreciation and amortization	(27,300)	(26,800)
Deferred Tax Liabilities Lease Assets	(9,000)	(9,000)
Other items	(3,600)	(2,100)
Deferred income tax liabilities	(39,900)	(37,900)
Net deferred income tax liability	(1,200)	(7,500)
Income Tax Disclosure Additional Details [Table] [Line Items]
Deferred Tax Liabilities, Other	3,600	2,100
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	8,200
Deferred Tax Assets, Tax Credit Carryforwards	2,400
Deferred Tax Assets, in Process Research and Development	7,900	10,600
Deferred Tax Assets, Net	1,200	7,500
Deferred Tax Assets, Tax Deferred Expense	12,100	13,700
Deferred Tax Liabilities, Tax Deferred Income	$ 10,900	$ 6,200