Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,330	$ (40,874)	$ 9,629	$ (39,636)
Other comprehensive (loss) income:
Foreign currency translation adjustment, net of tax	(1,760)	(29,846)	9,517	(23,775)
Comprehensive income (loss)	$ 3,570	$ (70,720)	$ 19,146	$ (63,411)