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Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Details) - USD ($)
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Condensed Financial Information Disclosure [Abstract]      
Parent's total ownership, percentage 100.00%    
Parent      
Condensed Financial Statements, Captions [Line Items]      
Pension and retiree benefits, parent obligation $ 295,000,000   $ 315,000,000
Proceeds from investment in subsidiary 23,000,000 $ 29,000,000  
Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations, subsidiary portion $ 108,000,000   $ 13,000,000