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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Feb. 28, 2023	Aug. 31, 2022	Feb. 28, 2022
Commitments And Contingencies [Line Items]
Liabilities	$ 286,808	$ 317,295	$ 320,046
Lindsay, Nebraska Facility [Member]
Commitments And Contingencies [Line Items]
Current environmental remediation accrual	$ 13,100
Liabilities discounted risk Free interest rate	1.20%
Discounted portion of liabilities	$ 11,400

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