v3.26.3
Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 1,697.7    
Ending balance 1,691.2 $ 1,697.7  
Unrealized Gain (Loss) on Derivative Financial Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 9.0 15.2 $ 27.0
Other comprehensive income (loss) before reclassifications 15.8 7.3 2.9
Amounts reclassified from AOCL (11.8) (13.5) (14.7)
Ending balance 13.0 9.0 15.2
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (37.4) (47.0) (32.1)
Other comprehensive income (loss) before reclassifications 6.8 9.6 (14.9)
Ending balance (30.6) (37.4) (47.0)
Other      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (2.8) (2.2) (2.2)
Other comprehensive income (loss) before reclassifications (0.7) (0.6)  
Ending balance (3.5) (2.8) (2.2)
AOCL      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (31.2) (34.0) (7.3)
Other comprehensive income (loss) before reclassifications 21.9 16.3 (12.0)
Amounts reclassified from AOCL (11.8) (13.5) (14.7)
Ending balance $ (21.1) $ (31.2) $ (34.0)