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Intangibles and Other Assets, Net - Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Millions | Nov. 30, 2021 | Aug. 31, 2021
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Intangibles and Other Assets by Major Class [Line Items] |  |
Finite-Lived Intangible Assets, Net, Total | $ 51.8 | $ 53.0
Intangible assets not subject to amortization | 2.4 | 2.4
Prepaid and other assets | 24.3 | 26.7
Operating lease ROU assets | 42.4 | 39.8
Nonqualified savings plan investments | 47.7 | 47.7
Debt issuance costs, net | 9.0 | 8.6
Assets held for sale | 5.4 | 5.4
Total Intangible and other assets, net | 183.0 | 183.6
Customer Relationships |  |
Intangibles and Other Assets by Major Class [Line Items] |  |
Finite lived intangible assets gross | 89.8 | 89.8
Accumulated amortization | (65.9) | (64.1)
Other Intangible Assets |  |
Intangibles and Other Assets by Major Class [Line Items] |  |
Finite lived intangible assets gross | 41.9 | 40.3
Accumulated amortization | $ (14.0) | $ (13.0)

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