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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 9,366 $ 16,708 $ 6,588
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustment 2,041 (2,107) (4,323)
Change in net unrealized (loss) gain on investments (14) 53 (21)
Less income tax benefit (provision) 5 (20) 7
Reclassification of realized (gain) loss on investments included in net income (1) [1] 0 (7) 1
Less income tax benefit (2) [2] 0 3 0
Other comprehensive income (loss), net of tax 2,032 (2,078) (4,336)
Comprehensive income $ 11,398 $ 14,630 $ 2,252
[1] Recorded in Other income (expense), net in our Consolidated Statements of Operations.
[2] Recorded in Income tax provision in our Consolidated Statements of Operations.