Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 479	$ 382
Senior Notes | 2032 Senior Notes
Debt Instrument [Line Items]
Contractual interest expense	5,531	0
Amortization of deferred financing costs	214	0
Total interest expense	5,745	0
Senior Notes | 2029 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	2,156	2,156
Amortization of deferred financing costs	265	249
Total interest expense	2,421	2,405
Senior Notes | 2025 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	0	614
Amortization of deferred financing costs	0	133
Total interest expense	$ 0	$ 747