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Fair Value Measurements (Details)	3 Months Ended	9 Months Ended
	Nov. 30, 2020 USD ($) investment	May 31, 2022 USD ($)	May 31, 2021 USD ($)	Aug. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		$ 318,200,000		$ 491,300,000
Asset impairment	$ 4,000,000	1,700,000	$ 4,000,000.0
Number of equity instruments | investment	1
Short-term borrowings outstanding		122,000,000.0		0
Line of Credit | Credit facility | the Revolving Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term borrowings outstanding		122,000,000		0
Approximate fair value of short term borrowings		122,000,000
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		10,400,000		5,300,000
Estimate of Fair Value Measurement | Unsecured debt | 2.150% Senior Unsecured Notes Due December 2030
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying and estimated fair values of financial instruments		$ 411,300,000		$ 496,500,000

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