Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 7,346	$ (5,651)	$ (8,230)	$ (12,546)
Derivative instruments:
Unrealized net gain (loss)	607		(141)
Net (gain) loss reclassified to earnings	(39)		(19)
Net changes related to available-for-sale securities, net of tax		4		(7)
Foreign currency translation adjustments	45	(4,289)	6,833	(7,439)
Other comprehensive income (loss)	613	(4,285)	6,673	(7,446)
Comprehensive income (loss)	$ 7,959	$ (9,936)	$ (1,557)	$ (19,992)