Long-Term Debt - Schedule of Interest Expense Related to Notes (Details) - 2028 and 2025 Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Contractual interest expense	$ 1,439	$ 1,294	$ 2,881	$ 2,616
Amortization of debt discount	251		502
Amortization of issuance costs	1,219	276	2,436	556
Total interest expense related to the Notes	$ 2,909	$ 1,570	$ 5,819	$ 3,172