Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2023	May 31, 2023	Aug. 31, 2022
Commitments And Contingencies [Line Items]
Liabilities	$ 290,009		$ 317,295
Lindsay, Nebraska Facility [Member]
Commitments And Contingencies [Line Items]
Current environmental remediation accrual		$ 11,500
Liabilities	$ 8,100		11,000
Liabilities discounted risk Free interest rate	1.20%
Discounted portion of liabilities	$ 9,100		$ 12,400