Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Payables and Accruals [Abstract]
Trade payables	$ 396.8	$ 401.5
Other accrued liabilities	90.3	102.8
Operating lease liabilities	$ 72.2	$ 56.4
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Accrued payroll and related liabilities	$ 158.6	$ 140.4
Accrued warranty	25.6	24.0	$ 27.9	$ 45.2
Accounts payable and accrued liabilities	$ 743.5	$ 725.1