Accumulated Other Comprehensive Loss - Schedule of Changes in Components of Accumulated Other Comprehensive Loss (Detail) $ in Thousands	6 Months Ended
	Jul. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (6,613)
Other comprehensive income	321
Ending balance	(6,292)
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,644)
Other comprehensive income	303
Ending balance	(6,341)
Unrealized Gain/Loss on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	31
Other comprehensive income	18
Ending balance	$ 49