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Intangibles and Other Assets, Net - Identifiable Intangibles and Other Assets, Net (Detail) - USD ($)
$ in Millions
Nov. 30, 2023
Aug. 31, 2023
Intangibles and Other Assets by Major Class [Line Items]    
Finite-Lived Intangible Assets, Net, Total $ 37.1 $ 39.1
Intangible assets not subject to amortization 2.3 2.3
Prepaid and other assets 49.2 56.4
Operating lease ROU assets $ 71.0 $ 70.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Total Intangibles and other assets, net Total Intangibles and other assets, net
Nonqualified savings plan investments $ 48.4 $ 47.7
Debt issuance costs, net 7.1 6.3
Assets held for sale 0.3 0.3
Deferred tax assets 33.5 33.1
Total Intangibles and other assets, net 248.9 255.8
Customer Relationships    
Intangibles and Other Assets by Major Class [Line Items]    
Finite lived intangible assets gross 87.5 87.5
Accumulated amortization (69.9) (69.1)
Other Intangible Assets    
Intangibles and Other Assets by Major Class [Line Items]    
Finite lived intangible assets gross 42.4 43.0
Accumulated amortization $ (22.9) $ (22.3)