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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	May 31, 2021	Aug. 31, 2020	May 31, 2020
Commitments And Contingencies [Line Items]
Liabilities	$ 306,044	$ 272,008	$ 274,528
Lindsay, Nebraska Facility [Member]
Commitments And Contingencies [Line Items]
Current environmental remediation accrual	16,100
Liabilities	$ 11,000
Liabilities discounted risk Free interest rate	1.20%
Discounted portion of liabilities	$ 12,400
Lindsay, Nebraska Facility [Member] | General and Administrative Expense [Member]
Commitments And Contingencies [Line Items]
Liabilities		$ 1,000

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