Stock-Based Compensation (Tables)

9 Months Ended

Feb. 28, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated: 

	Three months ended				Nine months ended
	February 28,		February 29,		February 28,		February 29,
	2025		2024		2025		2024
Stock option expense	$	0.2	$	0.6	$	1.0	$	3.6
Restricted stock unit expense		2.1		1.6		5.3		4.5
Management stock purchase plan		0.0		0.0		0.1		0.3
Employee stock purchase plan		0.1		0.1		0.3		0.3
Total stock-based compensation expense	$	2.4	$	2.3	$	6.7	$	8.7

Schedule of Shares Issued Pursuant to Share-based Compensation Activity

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:

	Three months ended		Nine months ended
	February 28,	February 29,	February 28,	February 29,
	2025	2024	2025	2024
Common Stock issued pursuant to stock-based compensation plans (in millions)	0.1	0.1	0.3	0.5