Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (246)	$ (11,694)	$ 473	$ (13,626)
Foreign currency translation adjustment	(225)	(459)	370	622
Reclassification adjustment for net foreign currency translation losses included in net loss		7,205		8,797
Comprehensive (loss) income	$ (471)	$ (4,948)	$ 843	$ (4,207)