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Acquisitions - Unaudited Pro Forma Information (Detail) - Zinc Ahead Inc [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Business Acquisition [Line Items]    
Pro forma revenues $ 428,059 $ 339,053
Pro forma net income $ 48,706 $ 34,211
Pro forma net income per share attributable to Class A and Class B common stockholders:    
Basic $ 0.37 $ 0.27
Diluted $ 0.34 $ 0.24