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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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Number of shares issued under share-based payment arrangement.

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Stock-Based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021	Sep. 21, 2021
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 1.6	$ 1.5	$ 6.1	$ 5.1
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	300	100	600	200
Stock option expense
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 0.6	$ 0.7	$ 3.1	$ 3.5
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					2,500
Restricted stock unit expense
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	0.9	0.7	2.5	1.4
Management stock purchase plan
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	0.0	0.0	0.3	0.0
Employee stock purchase plan
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 0.1	$ 0.1	$ 0.2	$ 0.2