Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (5,651)	$ (3,287)	$ (12,546)	$ 4,526
Other comprehensive (loss) income:
Net changes related to available-for-sale securities, net of tax	4	4	(7)	(3)
Foreign currency translation adjustments	(4,289)	524	(7,439)	588
Other comprehensive (loss) income	(4,285)	528	(7,446)	585
Comprehensive (loss) income	$ (9,936)	$ (2,759)	$ (19,992)	$ 5,111