Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 8,411	$ 9,958	$ 1,631
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		1,698	(2,003)	(865)
Change in net unrealized gain (loss) on investments		0	19	(31)
Less income tax (expense) benefit		0	(5)	6
Reclassification of realized loss on investments included in net income (1)	[1]	0	0	31
Less income tax benefit (2)	[2]	0	0	(8)
Other comprehensive income (loss), net of tax		1,698	(1,989)	(867)
Comprehensive income		$ 10,109	$ 7,969	$ 764

[1] Recorded in Other (expense) income, net in our Consolidated Statements of Operations.

[2] Recorded in Income tax (benefit) expense in our Consolidated Statements of Operations.