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Borrowings - 2031 Notes - Narrative (Details) - USD ($) $ in Thousands	Jan. 29, 2026	Jun. 30, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Outstanding principal amount		$ 5,123,322	$ 4,661,461
2031 Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 500,000
Interest rate	5.60%
Outstanding principal amount		$ 500,000
2031 Notes \| Tranche One \| Interest rate swaps
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000
Fixed interest rate (as a percent)	5.60%
Floating interest rate	1.9485%
2031 Notes \| Tranche Two \| Interest rate swaps
Debt Instrument [Line Items]
Aggregate principal amount	$ 200,000
Fixed interest rate (as a percent)	5.60%
Floating interest rate	1.955%
2031 Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price percentage	100.00%
2031 Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	100.00%
Debt instrument, basis spread on variable rate	0.30%