CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (11,042)	$ (5,445)
Other comprehensive loss:
Change in unrealized losses on available-for-sale securities, net of tax	(26)	(2)
Foreign currency translation adjustments	(1,222)	(2,652)
Total other comprehensive loss	(1,248)	(2,654)
Total comprehensive loss	$ (12,290)	$ (8,099)