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Debt and Lines of Credit - Long-term Debt (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 10, 2020	Aug. 31, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Total debt outstanding		$ 494.3	$ 401.1
Unsecured Term Loan | 2.150% Senior Unsecured Notes Due December 2030 | ABL
Debt Instrument [Line Items]
Scheduled future principal payment		500.0
Debt instrument, face amount	$ 500.0
Interest rate (percent)	2.15%
Debt instrument issuance price percent of total	99.737%
Debt issuance costs, gross	$ 4.8
Term of facility	10 years
Total debt outstanding		494.3
Industrial Revenue Bond | Carrying Value
Debt Instrument [Line Items]
Carrying and estimated fair value of financial instruments		0.0	4.0
Industrial Revenue Bond | Industrial revenue bond
Debt Instrument [Line Items]
Total debt outstanding		0.0	4.0
Bank loans | Carrying Value
Debt Instrument [Line Items]
Carrying and estimated fair value of financial instruments		0.0	2.1
Bank loans | Fixed-rate Bank Loans
Debt Instrument [Line Items]
Total debt outstanding		$ 0.0	$ 2.1

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