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STOCKHOLDERS' EQUITY - Summary of Information about Stock Options Outstanding (Detail 2)
12 Months Ended
Jan. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number, Outstanding Shares | shares 331,651
Number, Exercisable Shares | shares 253,151
Exercise Price Range $0.00 - $8.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Range $ 0.00
Maximum Range $ 8.00
Number, Outstanding Shares | shares 115,000
Weighted Average Remaining Contractual Life 2 years 2 months 19 days
Weighted Average Exercise Price $ 6.59
Number, Exercisable Shares | shares 115,000
Weighted Average Exercise Price, Exercisable $ 6.59
Exercise Price Range $8.01 - $12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Range 8.01
Maximum Range $ 12.00
Number, Outstanding Shares | shares 86,585
Weighted Average Remaining Contractual Life 1 year 6 months 22 days
Weighted Average Exercise Price $ 9.23
Number, Exercisable Shares | shares 86,585
Weighted Average Exercise Price, Exercisable $ 9.23
Exercisable Price Range $12.01 - $16.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Range 12.01
Maximum Range $ 16.00
Number, Outstanding Shares | shares 112,400
Weighted Average Remaining Contractual Life 6 years 7 days
Weighted Average Exercise Price $ 14.61
Number, Exercisable Shares | shares 36,400
Weighted Average Exercise Price, Exercisable $ 12.98
Exercisable Price Range $16.01 - $40.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Range 16.01
Maximum Range $ 40.00
Number, Outstanding Shares | shares 17,666
Weighted Average Remaining Contractual Life 6 years 1 month 13 days
Weighted Average Exercise Price $ 17.76
Number, Exercisable Shares | shares 15,166
Weighted Average Exercise Price, Exercisable $ 17.70