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Debt - Senior Credit Agreement (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Apr. 12, 2019
Debt Instrument [Line Items]        
Repayments on borrowings $ 475,000,000 $ 137,000,000    
2019 Revolver        
Debt Instrument [Line Items]        
Letters of credit outstanding 7,000,000      
2019 Term Loans | Line of Credit        
Debt Instrument [Line Items]        
Original principal amount of debt 475,000,000     $ 575,000,000
Revolver | 2019 Revolver | Line of Credit        
Debt Instrument [Line Items]        
Original principal amount of debt       $ 475,000,000
Borrowings from revolving credit facility 450,000,000      
Repayments of long-term debt     $ 0  
Total borrowing capacity remaining 18,000,000      
Line of Credit, Current $ 450,000,000