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Long-Term Debt - 6.25 Percent Notes (Details) - USD ($)
9 Months Ended
Jun. 08, 2020
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Debt Instrument [Line Items]        
Repayment amount   $ 304,000,000 $ 46,000,000  
6.25 percent notes due 2025 | Prior to June 1, 2022        
Debt Instrument [Line Items]        
Redemption Price   106.25%    
Senior Notes | 6.25 percent notes due 2025        
Debt Instrument [Line Items]        
Interest rate (percent) 6.25%      
Principle amount of debt $ 300,000,000      
Premium as a percentage of principal to be earned in the event of redemption 1.00%      
Proceeds from debt issuances $ 295,000,000      
Basis spread on variable rate 0.50%      
Percentage of principal that may be redeemed   35.00%    
Redemption Price 100.00%      
Percentage of principal outstanding   65.00%    
Senior Notes | 6.25 percent notes due 2025 | Prior to June 1, 2022        
Debt Instrument [Line Items]        
Redemption Price 100.00%      
Senior Notes | 6.25 percent notes due 2025 | 2022        
Debt Instrument [Line Items]        
Redemption Price 103.125% 103.125%    
Senior Notes | 6.25 percent notes due 2025 | 2023        
Debt Instrument [Line Items]        
Redemption Price   101.563%    
Senior Notes | 6.25 percent notes due 2025 | 2024 and thereafter        
Debt Instrument [Line Items]        
Redemption Price   100.00%    
Senior Notes | 6.25 percent notes due 2025 | Change in Control Redemption        
Debt Instrument [Line Items]        
Redemption Price   101.00%    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Borrowings outstanding   $ 0   $ 0
Revolving Credit Facility | Amended Revolving Credit Facility        
Debt Instrument [Line Items]        
Repayment amount $ 295,000,000      
Borrowings outstanding $ 304,000,000