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Stock-Based Compensation
 6 Months Ended
Nov. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation STOCK-BASED COMPENSATION
 
The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated: 
 Three months endedSix months ended
November 30,November 30,
 2024202320242023
Stock option expense$0.2 $2.4 $0.8 $3.0 
Restricted stock unit expense1.7 1.4 3.2 2.9 
Management stock purchase plan0.1 0.3 0.1 0.3 
Employee stock purchase plan0.1 0.0 0.2 0.2 
Total stock-based compensation expense$2.1 $4.1 $4.3 $6.4 
During the second quarter of fiscal 2025, the Company granted performance-based restricted stock units to certain officers and senior management. Compensation expense is recognized over the requisite service period based on expected attainment of pre-established performance goals.

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
 Three months endedSix months ended
November 30,November 30,
 2024202320242023
Common Stock issued pursuant to stock-based compensation plans (in millions)0.1 0.3 0.2 0.4