v3.26.1
Employee Retirement Plans - Components of Net Periodic Pension Income for Defined Benefit Pension Plans Along with Assumptions used to Determine Benefit Obligation and Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Pension Benefit | U.S.      
Defined benefit plans components of expense:      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 2.5 2.8 3.5
Expected return on plan assets (2.7) (3.0) (4.0)
Net amortization and deferral costs (0.3) (0.3) (0.3)
Settlement gain 0.0 (20.0)  
Settlement gain 0.0 (2.7) 0.0
Curtailment gain 0.0 0.0 0.0
Net periodic benefit income $ (0.5) $ (3.2) $ (0.8)
Weighted-average assumptions used to determine benefit obligations      
Discount rate 5.40% 5.40% 5.60%
Weighted-average assumptions used to determine net expenses      
Discount rate 5.40% 5.60% 4.80%
Expected rate of return on plan assets 6.50% 6.50% 6.50%
Pension Benefit | Non-U.S      
Defined benefit plans components of expense:      
Service cost $ 1.4 $ 0.0 $ 0.0
Interest cost 0.6 0.1 0.1
Expected return on plan assets (1.6) 0.0 0.0
Net amortization and deferral costs 0.0 0.0 0.0
Settlement gain (5.1) 0.0  
Settlement gain (0.3) 0.0 0.0
Curtailment gain (1.1) 0.0 0.0
Net periodic benefit income $ (1.0) $ 0.1 $ 0.1
Weighted-average assumptions used to determine benefit obligations      
Discount rate 1.30% 3.80% 3.50%
Compensation rate increase [1] 1.50%    
Interest crediting rate [1] 2.00%    
Weighted-average assumptions used to determine net expenses      
Discount rate 1.00% 2.50% 2.50%
Expected rate of return on plan assets 4.70%    
Compensation rate increase [1] 1.50%    
Interest crediting rate [1] 2.00%    
Other Benefits      
Defined benefit plans components of expense:      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 0.2 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0
Net amortization and deferral costs (0.2) (0.2) (0.1)
Settlement gain 0.0 0.0  
Settlement gain 0.0 0.0 0.0
Curtailment gain 0.0 0.0 0.0
Net periodic benefit income $ 0.0 $ 0.0 $ 0.1
Weighted-average assumptions used to determine benefit obligations      
Discount rate 5.40% 5.40% 5.60%
Weighted-average assumptions used to determine net expenses      
Discount rate 5.40% 5.60% 4.80%
[1] Relates to only the Stanzwerk AG pension plan, which was assumed in connection with the Sitem Group acquisition.