Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 1,335	$ 4,277	$ 5,023	$ 12,864
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		2,535	(1,272)	57	(1,718)
Change in net unrealized gain (loss) on investments		8	6	(2)	49
Less income tax (provision) benefit		(3)	(2)	1	(18)
Reclassification of realized gain on investments included in net income (1)	[1]	0	0	0	(7)
Less income tax benefit (2)	[2]	0	0	0	3
Other comprehensive income (loss), net of tax		2,540	(1,268)	56	(1,691)
Comprehensive income		$ 3,875	$ 3,009	$ 5,079	$ 11,173

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

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