Borrowings - 2024 Notes (Narrative) (Details) - USD ($) $ in Thousands	Apr. 08, 2024	Jun. 30, 2024	Sep. 30, 2023	Oct. 15, 2021	Apr. 15, 2021	Oct. 02, 2020
Debt Instrument [Line Items]
Long-term debt		$ 4,315,465	$ 3,117,719
2024 Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 100,000		$ 400,000
Debt redemption, principal amount	$ 500,000
Debt instrument, redemption price, percentage	100.00%
Long-term debt			$ 500,000
Interest rate					3.375%