v3.26.1
Income Taxes - Reconciliation of Federal Statutory Corporate Income Tax Rate to Total Tax Provision (Detail) - USD ($)
$ in Millions
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Amount      
Federal statutory corporate income tax rate $ 1.5    
State and local income taxes, net of federal tax benefit [1] 3.0    
Other 0.4    
Effects of cross-borders tax laws      
Global intangible low-taxed income 1.3    
Foreign-derived intangible income (1.0)    
Tax credits (0.2)    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 4.1    
Tax effect of income attributable to noncontrolling interests (3.1)    
Nondeductible executive compensation 2.8    
Share-based compensation (1.1)    
Nondeductible transaction costs 0.7    
Meals and entertainment costs 0.5    
Nondeductible fringe benefit 0.4    
Changes in unrecognized tax benefits 1.8    
Other adjustments:      
Interest and penalties related to unrecognized tax benefits 0.8    
Tax on unremitted foreign earnings 0.3    
Other 0.1    
Effective tax rate $ 20.0 $ 28.8 $ 46.1
Percent      
Federal statutory corporate income tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal tax benefit 42.40% [1] 1.90% 2.20%
Foreign currency translation and rate effects   (4.60%) 0.60%
Other 4.70% 0.50% (1.40%)
Effects of cross-borders tax laws      
Global intangible low-taxes income 18.30%    
Foreign-derived intangible income (14.80%)    
Tax credits (2.80%)    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 58.50%    
Tax effect of income attributable to noncontrolling interests (43.60%)    
Nondeductible executive compensation 39.00%    
Share-based compensation (14.90%) 1.80% 0.60%
Nondeductible transaction costs 10.30%    
Meals and entertainment costs 7.10%    
Nondeductible fringe benefit 4.90%    
Changes in unrecognized tax benefits 26.00%    
Other adjustments:      
Interest and penalties related to unrecognized tax benefits 11.60%    
Tax on unremitted foreign earnings 4.30%    
Other 0.60%    
Effective tax rate 282.70%    
Effective tax rate attributable to controlling interest   20.60% 23.00%
Canada      
Amount      
Foreign currency translation and rate effects $ 0.7    
Other (0.1)    
Effects of cross-borders tax laws      
Tax credits (2.7)    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 0.9    
Percent      
Foreign currency translation and rate effects 9.50%    
Other (1.10%)    
Effects of cross-borders tax laws      
Tax credits (37.90%)    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 13.40%    
China      
Amount      
Other $ 0.0    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 0.5    
Percent      
Other (0.40%)    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 7.50%    
Germany      
Amount      
Changes in valuation allowances $ 7.7    
Other $ (0.4)    
Percent      
Changes in valuation allowances 108.30%    
Other (5.70%)    
India      
Amount      
Other $ 0.2    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 0.3    
Percent      
Changes in valuation allowances 4.70%    
Other 1.80%    
Italy      
Amount      
Foreign currency translation and rate effects $ (0.7)    
Opening balance sheet adjustments (0.6)    
Other 0.0    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 3.0    
Percent      
Foreign currency translation and rate effects (9.20%)    
Opening balance sheet adjustments (8.40%)    
Other 0.70%    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 42.30%    
Mexico      
Amount      
Nondeductible wages $ 0.5    
Foreign currency translation and rate effects (6.7)    
Other 0.1    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 1.2    
Percent      
Foreign currency translation and rate effects (93.80%)    
Nondeductible wages 7.20%    
Other 0.70%    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 16.90%    
Switzerland      
Amount      
Foreign currency translation and rate effects $ 2.5    
Opening balance sheet adjustments 0.9    
Changes in valuation allowances (1.5)    
Amended return net operating loss adjustment 1.4    
Other 0.0    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment $ 0.5    
Percent      
Foreign currency translation and rate effects 35.60%    
Changes in valuation allowances (21.00%)    
Amended return net operating loss adjustment 19.30%    
Opening balance sheet adjustments 12.30%    
Other 0.20%    
Nontaxable or nondeductible items:      
Nondeductible goodwill impairment 7.20%    
[1] State and local taxes in Illinois, Michigan, and Kentucky make up the majority (greater than 50%) of the tax effect in this category.