Income Taxes - Schedule of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Current:
U.S. federal tax	$ 818	$ 5,273	$ 3,135
U.S. state taxes	(212)	541	93
Non-U.S. foreign taxes	1,454	1,874	1,348
Current income tax provision	2,060	7,688	4,576
Deferred:
U.S. federal tax	1,174	1,050	(3,208)
U.S. state taxes	0	0	0
Non-U.S. foreign taxes	(163)	(37)	97
Deferred income tax provision	1,011	1,013	(3,111)
Provision for income taxes	$ 3,071	$ 8,701	$ 1,465