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Debt - Financing Activity and Covenants - Additional Information (Details)
 9 Months Ended
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 673,000,000
Covenant restrictions [Abstract]  
Maximum consolidated leverage ratio 4.5
Calculated leverage ratio 3.6
Minimum required consolidated interest coverage ratio 3.0
Calculated consolidated interest coverage ratio 5.6
Revolving Credit Facility [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 661,000,000
Line of credit facility outstanding principal amount 90,000,000
Letters of Credit Outstanding, Amount 49,000,000
Accounts Receivable Securitization [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 12,000,000