v3.26.1
Income Taxes - Schedule of reconciliation of income taxes paid (Detail) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Income Tax Paid, by Individual Jurisdiction [Line Items]      
U.S. Federal $ 29.9    
U.S. State 5.1    
Income Taxes paid, net of refunds received 42.6    
Income taxes paid, net [1]   $ 26.2 $ 37.6
Canada      
Income Tax Paid, by Individual Jurisdiction [Line Items]      
Income Taxes paid, net of refunds received 4.8    
Other      
Income Tax Paid, by Individual Jurisdiction [Line Items]      
Income Taxes paid, net of refunds received $ 2.8    
[1] The amount of cash paid for income taxes paid, net of refunds, in fiscal 2024 for the period prior to the Separation was not distinguishable for the Company. These amounts were combined with the Former Parent. Due to the legal organizational structure, capital structure, and income tax compliance requirements, the amounts for the Company were indivisible from those that were included with the Former Parent. The amounts disclosed for income taxes paid, net of refunds represent all distinguishable amounts, which includes domestic taxes paid after the Separation and foreign taxes paid for the entire fiscal year.