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Income Taxes - Tax Effects of Temporary Differences that give rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Millions
Aug. 31, 2025
Aug. 31, 2024
Deferred tax assets:    
Accrued payroll and related liabilities $ 32.7 $ 35.0
Accrued liabilities 5.2 3.5
Deferred revenue 11.2 6.7
Inventories and other 15.8 7.7
Maintenance and warranty accruals 4.8 5.5
Lease liability 18.8 14.7
Interest expense 15.5 13.4
Net operating losses 21.2 35.9
Investment, asset tax credits and other 16.3 16.2
Deferred Tax Assets, Gross, Total 141.5 138.6
Valuation allowance (13.9) (15.9)
Deferred tax liabilities:    
Fixed assets (234.3) (187.2)
Intangibles (3.6) (5.6)
Right-of-use asset (18.5) (14.4)
Other (9.5) (11.5)
Deferred Tax Liabilities, Gross, Total (265.9) (218.7)
Net deferred tax liability $ (138.3) $ (96.0)