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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($)	3 Months Ended	6 Months Ended	44 Months Ended
	Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2021	May 31, 2021	Mar. 18, 2020	Mar. 21, 2018
Stockholders' Equity Attributable to Parent [Abstract]
Authorized amount of stock to be repurchased				$ 100,000,000.0	$ 50,000,000.0	$ 50,000,000.0
Total current Board authorizations	$ (4,200,000)		$ (36,900,000)
Less repurchases made under these authorizations	$ 63,100,000	$ 63,100,000	$ 63,100,000
Number of common stock repurchased (in shares)	4.2	4.2

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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