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Intangibles and Other Assets, Net - Identifiable Intangible and Other Assets (Detail) - USD ($)
$ in Millions
Nov. 30, 2022
Aug. 31, 2022
Intangibles and Other Assets by Major Class [Line Items]    
Finite-Lived Intangible Assets, Net, Total $ 45.9 $ 47.3
Intangible assets not subject to amortization 2.4 2.4
Prepaid and other assets 34.9 32.4
Operating lease ROU assets $ 52.7 $ 54.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Total Intangible and other assets, net Total Intangible and other assets, net
Nonqualified savings plan investments $ 45.0 $ 40.3
Debt issuance costs, net 7.8 8.7
Assets held for sale 0.3 3.8
Total Intangible and other assets, net 189.0 189.1
Customer Relationships    
Intangibles and Other Assets by Major Class [Line Items]    
Finite lived intangible assets gross 87.5 87.5
Accumulated amortization (66.9) (66.1)
Other Intangible Assets    
Intangibles and Other Assets by Major Class [Line Items]    
Finite lived intangible assets gross 43.3 42.4
Accumulated amortization $ (18.0) $ (16.5)