Borrowings - 2027 Notes (Narrative) (Details) - USD ($) $ in Thousands	Aug. 03, 2021	Jun. 30, 2024	Sep. 30, 2023	Feb. 15, 2022
Debt Instrument [Line Items]
Long-term debt		$ 4,315,465	$ 3,117,719
2027 Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 350,000
Long-term debt		$ 350,000	$ 350,000
Interest rate				2.05%
Debt instrument, redemption price, percentage	100.00%
2027 Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.25%