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Discontinued Operations - Schedule of Reconciliation of Major Line Items Constituting Pretax Income (Loss) from Discontinued Operations to Net Income (Loss) from Discontinued Operations (Detail) - Interior Products [Member] - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disposal Group Including Discontinued Operation Income Statement Disclosures [Line Items]    
Net sales $ 248.8 $ 259.8
Cost of products sold (183.8) (189.2)
Selling, general and administrative (56.9) (53.7)
Depreciation and amortization (12.9) (16.0)
Other income (loss) 0.1 0.2
Loss on classification as held for sale (355.4)  
Pretax income (loss) from discontinued operations (360.1) 1.1
Provision for (benefit from) income taxes (92.2) 0.5
Net income (loss) from discontinued operations $ (267.9) $ 0.6