Debt - Schedule of Debt Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Gross Amount	$ 333,373	$ 367,762
Less current portion, Gross Amount	103,373	34,389
Gross Amount, excluding current maturities	230,000	333,373
Debt Issuance Costs	(6,045)	(7,650)
Less current portion, Debt Issuance Costs	(301)	(124)
Debt Issuance Costs, excluding current portion	(5,744)	(7,526)
Long-Term Debt, Total	327,328	360,112
Less current portion, carrying amount	103,072	34,265
Carrying Amount	224,256	325,847
Senior Notes
Debt Instrument [Line Items]
Gross Amount	333,373
Senior Notes | 2029 Convertible Notes
Debt Instrument [Line Items]
Gross Amount	230,000	230,000
Debt Issuance Costs	(5,744)	(6,716)
Long-Term Debt, Total	224,256	223,284
Senior Notes | 2025 Convertible Notes
Debt Instrument [Line Items]
Gross Amount	103,373	103,373
Debt Issuance Costs	(301)	(810)
Long-Term Debt, Total	103,072	102,563
Senior Notes | 2024 Convertible Notes
Debt Instrument [Line Items]
Gross Amount	0	34,389
Debt Issuance Costs	0	(124)
Long-Term Debt, Total	$ 0	$ 34,265