CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (5,310)	$ (18,154)	$ (14,113)	$ (24,712)
Other comprehensive income (loss):
Foreign currency translation adjustments (net of taxes of $0.1 million and $0.0 million for 2016 and 2015, respectively)	392	(465)	1,941	(2,108)
Other comprehensive income (loss)	392	(465)	1,941	(2,108)
Comprehensive loss	$ (4,918)	$ (18,619)	$ (12,172)	$ (26,820)