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Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
May 31, 2022
Loss Contingencies [Line Items]        
Tax adjustments, settlements, and unusual provisions $ 0.0      
Deferred tax liabilities, net 90.3 $ 84.9    
Deferred tax assets, net 24.6 23.1    
Unrecognized tax benefits 1.2 1.8 $ 2.0 $ 3.1
Income tax penalties and interest accrued 0.3 0.3 0.1  
Unrecognized tax benefits that would impact effective tax rate 1.2 1.8 2.0  
Tax (expense) benefit from income tax penalties and interest expense 0.1 0.1 0.1  
Valuation allowance, deferred tax asset, increase (decrease), amount (2.8) (1.8)    
Deferred Tax Assets, Charitable Contribution Carryforwards 0.3      
Tax Credit Carryforward, Amount 3.2      
Tax carryforwards 32.4 $ 30.1    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 0.4      
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 3.4      
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 25.2      
Sales Tax        
Loss Contingencies [Line Items]        
Tax adjustments, settlements, and unusual provisions     $ 1.8  
United States        
Loss Contingencies [Line Items]        
Operating Loss Carryforwards 1.6      
State and Local Jurisdiction        
Loss Contingencies [Line Items]        
Operating Loss Carryforwards 60.8      
Non-United States        
Loss Contingencies [Line Items]        
Operating Loss Carryforwards $ 103.1