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Borrowings - 2026 Notes Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Oct. 13, 2021
Sep. 30, 2021
Aug. 24, 2021
Feb. 24, 2021
Debt Instrument [Line Items]          
Debt $ 3,093,603   $ 2,569,228    
US Treasury (UST) Interest Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.25%        
2026 Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 200,000     $ 400,000
Debt $ 597,930   $ 400,000    
Interest Rate       2.50%  
Debt instrument, redemption price, percentage 100.00%        
2026 Notes | US Treasury (UST) Interest Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.30%