Borrowings - Schedule of Components of the Carrying Value of Notes (Details) - USD ($)	Sep. 30, 2025	Feb. 27, 2025	Sep. 30, 2024	Aug. 15, 2023	May 18, 2021	Feb. 25, 2020
Debt Instrument [Line Items]
Unamortized financing costs	$ (6,561,000)		$ (4,935,000)
Net carrying value	1,486,880,000		1,638,693,000
2027 Notes
Debt Instrument [Line Items]
Principal	350,000,000.0				$ 350,000,000
Unamortized financing costs	(1,000,000.0)
Unaccreted discount	(200,000)				$ (1,000,000)
Interest rate swap fair value adjustment	(12,200,000)
Net carrying value	336,600,000
Fair Value	339,800,000
2029 Notes
Debt Instrument [Line Items]
Principal	300,000,000.0		350,000,000.0	$ 300,000,000
Unamortized financing costs	(2,200,000)		(1,800,000)
Unaccreted discount	(2,100,000)		(400,000)	$ (3,500,000)
Interest rate swap fair value adjustment	4,800,000		(20,200,000)
Net carrying value	300,500,000		327,600,000
Fair Value	314,500,000		327,700,000
2030 Notes
Debt Instrument [Line Items]
Principal	300,000,000.0	$ 300,000,000	300,000,000.0
Unamortized financing costs	(3,300,000)		(2,900,000)
Unaccreted discount	0	$ (100,000)	(2,700,000)
Interest rate swap fair value adjustment	8,100,000		7,200,000
Net carrying value	304,800,000		301,600,000
Fair Value	$ 301,100,000		312,300,000
2025 Notes
Debt Instrument [Line Items]
Principal			300,000,000.0			$ 300,000,000
Unamortized financing costs			(300,000)
Unaccreted discount			(200,000)			$ (2,500,000)
Interest rate swap fair value adjustment			0
Net carrying value			299,500,000
Fair Value			$ 298,100,000