Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,459	$ 1,466	$ 4,069	$ 4,038
Other comprehensive income (loss):
Unrealized holding gains on available-for- sale securities, net of tax	185	13	6	57
Foreign currency translation adjustments	794	520	1,067	(798)
Other comprehensive income (loss)	979	533	1,073	(741)
Comprehensive income	$ 3,438	$ 1,999	$ 5,142	$ 3,297