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Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Property Plant And Equipment [Abstract]        
Depreciation $ 1.2 $ 0.4 $ 2.4 $ 0.8