v3.26.1
Reconciliation of Income Taxes Computed at the U.S. Federal Statutory Tax Rate to Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Amount      
Federal statutory income tax expense and rate $ (1.9) $ (237.9) $ (3.0)
State and local income taxes, net of federal income tax effect (1.5) [1] (1.9) (2.7)
Permanent differences   (1.5) 0.3
Global intangible low-taxed income (net of foreign tax credits) (0.2) 8.2 7.1
Foreign derived intangible income deduction (FDII)   (0.6) (0.4)
Foreign rate differential   (2.3) (4.0)
Goodwill impairment   202.8  
Subpart F (net of foreign tax credits) 2.4 2.1 1.2
R&D credits (0.7)    
Tax-effect from stock-based compensation   2.6 2.2
Tax credits   (11.5) (7.7)
Impact of tax rate changes   (1.0)  
Change in tax-related uncertainties   1.3 1.9
Changes in valuation allowances   (0.1) (0.5)
Research expenditures deduction   (0.4) (0.3)
Equity- based compensation 2.7    
Officer compensation 0.6    
Changes in unrecognized tax benefits 1.5    
Other 0.9 (0.9) 1.0
Income tax (benefit) expense $ (1.1) $ (41.1) $ (4.9)
Percent      
Federal statutory income tax expense and rate 21.00%    
State and local income taxes, net of federal income tax effect [1] 16.40%    
Other (9.80%)    
Global intangible low-taxed income (net of foreign tax credits) 1.70%    
Subpart F (net of foreign tax credits) (26.40%)    
R&D credits 7.70%    
Equity- based compensation (29.90%)    
Officer compensation (7.00%)    
Changes in unrecognized tax benefits (17.00%)    
Income tax (benefit) expense 12.40%    
Brazil      
Amount      
Foreign rate differential $ 1.6    
Other $ 0.4    
Percent      
Foreign rate differential (17.70%)    
Other (4.20%)    
Canada      
Amount      
Changes in valuation allowances $ (0.5)    
Other $ 0.1    
Percent      
Other (0.40%)    
Changes in valuation allowances 5.00%    
Ireland      
Amount      
Foreign rate differential $ (2.0)    
Pillar Two 1.0    
Other $ (0.3)    
Percent      
Foreign rate differential 22.00%    
Other 3.10%    
Pillar Two (10.50%)    
Mexico      
Amount      
Foreign rate differential $ 0.5    
Percent      
Foreign rate differential (5.60%)    
Switzerland      
Amount      
Foreign rate differential $ (5.9)    
Other $ (0.5)    
Percent      
Foreign rate differential 65.40%    
Other 5.30%    
Switzerland | Cantonal Tax      
Amount      
Foreign rate differential $ 3.4    
Percent      
Foreign rate differential (37.00%)    
United Kingdom      
Amount      
Non-taxable gain adjustment $ (5.0)    
Other $ 0.3    
Percent      
Other (3.70%)    
Non-taxable gain adjustment 55.50%    
Other Foreign Jurisdictions      
Amount      
Other $ 2.0    
Percent      
Other (21.60%)    
[1] State and local taxes in California, Pennsylvania, and City of Lansing, Michigan accounted for the majority (greater than 50 percent) of the tax impact in this category.