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Borrowings - 2027 Notes Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Feb. 15, 2022
Aug. 03, 2021
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%      
2027 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 350,000
Debt $ 347,159 $ 350,000    
Interest Rate     2.05%  
Debt instrument, redemption price, percentage 100.00%