CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 8,564	$ 7,681	$ (80,022)	$ 7,658
Cumulative foreign translation adjustments	1,766	(821)	6,793	(7,386)
Unrealized gain (loss) on marketable securities, net of tax effects of $0 and ($58) during the three and nine months ended June 30, 2016 and $18 and $(57) during the three and nine months ended June 30, 2015	11	(48)	(92)	154
Actuarial gain, net of tax effects of $1 and $0 during the three and nine months ended June 30, 2016 and $3 and $0 during the three and nine months ended June 30, 2015	(1)	(12)	2	(3)
Total other comprehensive income (loss), net of tax	1,776	(881)	6,703	(7,235)
Comprehensive income (loss), net of tax	$ 10,340	$ 6,800	$ (73,319)	$ 423