CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in-Capital	Additional Paid-in-Capital Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Balance at Sep. 30, 2021	$ 1,031,945		$ 381	$ 1,002,353		$ 27,577		$ 1,634
Balance (in shares) at Sep. 30, 2021			38,025
Net loss	(310,826)					(310,826)
Other comprehensive income (loss)	(35,371)							(35,371)
Issuance of common stock	36,062		$ 14	36,048
Issuance of common stock, (in shares)			1,584
Stock withheld to cover tax withholdings requirements upon stock vesting	(49,003)		$ (1)	(49,002)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)			(179)
Stock-based compensation	40,143			40,143
Balance at Sep. 30, 2022	$ 712,950	$ (8,530)	$ 394	1,029,542	$ (14,371)	(283,249)	$ 5,841	(33,737)
Balance (in shares) at Sep. 30, 2022			39,430
Accounting Standards Update [Extensible Enumeration]	us-gaap:AccountingStandardsUpdate202006CumulativeEffectPeriodOfAdoptionMember
Net loss	$ (56,254)					(56,254)
Other comprehensive income (loss)	5,771							5,771
Issuance of common stock	5,625		$ 11	5,614
Issuance of common stock, (in shares)			1,055
Increase in fair value of conversion option	4,054			4,054
Stock withheld to cover tax withholdings requirements upon stock vesting	(4,894)		$ (1)	(4,893)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)			(62)
Stock-based compensation	36,153			36,153
Balance at Sep. 30, 2023	694,875		$ 404	1,056,099		(333,662)		(27,966)
Balance (in shares) at Sep. 30, 2023			40,423
Net loss	(588,078)					(588,078)
Other comprehensive income (loss)	2,054							2,054
Issuance of common stock	10,901		$ 15	10,886
Issuance of common stock, (in shares)			1,502
Stock withheld to cover tax withholdings requirements upon stock vesting	(9,865)			(9,865)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)			(1)
Stock-based compensation	31,210			31,210
Balance at Sep. 30, 2024	$ 141,097		$ 419	$ 1,088,330		$ (921,740)		$ (25,912)
Balance (in shares) at Sep. 30, 2024			41,924