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Share-Based Compensation - Aggregated Information Regarding RSUs and RSAs Granted (Detail) - Restricted Stock Award And Restricted Stock Unit [Member]
3 Months Ended
Apr. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Outstanding Restricted Stock Units and Restricted Stock Awards | shares 293,088
Granted, Restricted Stock Units and Restricted Stock Awards | shares 4,597
Vested, Restricted Stock Units and Restricted Stock Awards | shares (34,180)
Forfeited, Restricted Stock Units and Restricted Stock Awards | shares (18,600)
Ending balance, Outstanding Restricted Stock Units and Restricted Stock Awards | shares 244,905
Beginning balance, Weighted Average Grant Date Fair Value | $ / shares $ 13.28
Granted, Weighted Average Grant Date Fair Value | $ / shares 15.06
Vested, Weighted Average Grant Date Fair Value | $ / shares 11.90
Forfeited, Weighted Average Grant Date Fair Value | $ / shares 10.07
Ending balance, Weighted Average Grant Date Fair Value | $ / shares $ 13.75