Debt - Note Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023	May 14, 2018	Jul. 05, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 3,500	$ 0	$ 3,545
2024 Convertible Notes | Senior Notes
Debt Instrument [Line Items]
Repurchased principal amount			109,400
Stated interest rate							2.875%
Repurchase price			117,500
Loss on extinguishment of debt	$ 0	$ 0		0	8,935
2025 Convertible Notes | Senior Notes
Debt Instrument [Line Items]
Repurchased principal amount			69,100
Stated interest rate						2.375%
Repurchase price			$ 62,900
Loss on extinguishment of debt	$ 0	$ 0		$ 0	$ (5,389)