v3.26.3
Income Taxes - Reconciliation Between Effective and Statutory Tax Rates on Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2024
Amount      
U.S. federal statutory tax rate $ 16.5    
Tax Jurisdiction of Domicile [Extensible Enumeration] U.S.    
State and local income taxes, net of federal benefit $ 2.5    
Effects of cross-border tax laws, U.S. branch income 6.9    
Effects of cross-border tax laws, BEAT (1.8)    
Effects of cross-border tax laws, Other 0.5    
Tax credits, Foreign tax credits (10.7)    
Tax credits, Other (0.7)    
Change in valuation allowance 9.1 $ (2.0) $ 6.3
Nontaxable or nondeductible Items, Officer compensation 3.3    
Nontaxable or nondeductible Items, Stock based compensation (2.0)    
Nontaxable or nondeductible Items, Other (1.6)    
Changes in unrecognized tax benefits (0.4)    
Other reconciling items, Interest on tax refunds (3.0)    
Other reconciling items, Other 1.6    
Income tax expense $ 17.4 $ 91.4 $ 62.0
Percent      
U.S. federal statutory tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal benefit 3.20% 2.00% 1.40%
Foreign operations, Statutory tax rate difference   2.00% 4.60%
U.S. tax on foreign earnings   0.70% 2.30%
U.S. impact of foreign branch   2.30% (1.90%)
Nontaxable or nondeductible items, Permanent differences   1.20% 4.00%
Effects of cross-border tax laws, U.S. branch income 8.70%    
Effects of cross-border tax laws, BEAT (2.20%)    
Effects of cross-border tax laws, Other 0.60%    
BEAT and minimum taxes   4.40% 0.50%
Change in valuation allowance   (0.80%) 2.80%
Uncertain tax positions   0.30% 0.70%
Noncontrolling interest in flow-through entity   (0.30%) (0.30%)
Credits   (0.80%) (4.70%)
Tax credits, Foreign tax credits (13.60%)    
Tax credits, Other (1.00%)    
Nontaxable or nondeductible Items, Officer's compensation 4.20%    
Nontaxable or nondeductible Items, Stock based compensation (2.50%)    
Nontaxable or nondeductible Items, Other (2.00%)    
Changes in unrecognized tax benefits (0.50%)    
Other adjustments, Interest on tax refunds (3.80%)    
Other adjustments, Other 1.90%    
Other   0.10% (2.70%)
Effective tax rate 22.10% 32.10% 27.70%
U.S.      
Amount      
Change in valuation allowance $ 4.6    
Percent      
Change in valuation allowance 5.90%    
Mexico      
Amount      
Statutory tax rate difference $ 5.6    
Nondeductible compensation 3.0    
Foreign currency / inflationary effects (11.4)    
Other 0.4    
Change in valuation allowance $ 1.5    
Percent      
Foreign operations, Statutory tax rate difference 7.20%    
Nontaxable or nondeductible items, Permanent differences 3.80%    
Foreign currency / inflationary effects (14.50%)    
Change in valuation allowance 1.90%    
Other 0.60%    
Romania      
Amount      
Minimum tax $ 2.1    
Other $ (1.5)    
Percent      
Minimum tax 2.70%    
Other (2.00%)    
Canada      
Amount      
Withholding tax $ 1.2    
Percent      
Withholding tax 1.50%    
Other Foreign Jurisdictions:      
Amount      
Statutory tax rate difference $ 0.8    
Percent      
Foreign operations, Statutory tax rate difference 1.00%