Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 1,905	$ 10,917
Deferred tax liabilities, non-current	1,333	1,423
Other long-term liabilities	3	2
Total other long-term liabilities	$ 3,241	$ 12,342