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Stock-Based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	Sep. 21, 2021
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 3.0	$ 3.0	$ 4.5	$ 3.6
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	200	100	300	100
Stock option expense
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 1.8	$ 2.5	$ 2.5	$ 2.8
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	0.5	1.6	0.7
Management stock purchase plan
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	0.3	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	$ 0.0	$ 0.0	$ 0.1	$ 0.1

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