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Borrowings - 2024 Notes Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Oct. 15, 2021
Apr. 15, 2021
Oct. 02, 2020
Debt Instrument [Line Items]          
Debt $ 3,116,857 $ 3,093,603      
US Treasury (UST) Interest Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.25%        
2024 Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 100,000   $ 400,000
Debt $ 501,441 $ 500,000      
Interest Rate       3.375%  
Debt instrument, redemption price, percentage 100.00%        
2024 Notes | US Treasury (UST) Interest Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 50.00%