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STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares
shares in Thousands
 6 Months Ended
Jul. 31, 2017
Jan. 31, 2017
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
STOCK-BASED COMPENSATION            
Shares, Outstanding, Beginning balance         707 1,064
Shares, Granted         125 105
Shares, Exercised         (80) (195)
Shares, Forfeited         (10)  
Shares, Outstanding, Ending balance 742 707 974 1,064 742 974
Shares, Exercisable 462   704   462 704
Weighted Average Exercise Price, Outstanding, Beginning balance         $ 39.04 $ 26.38
Weighted Average Exercise Price, Granted         63.58 36.09
Weighted Average Exercise Price, Exercised         30.48 21.59
Weighted Average Exercise Price, Forfeited         71.75  
Weighted Average Exercise Price, Outstanding, Ending balance $ 43.66 $ 39.04 $ 28.39 $ 26.38 43.66 28.39
Weighted Average Exercise Price, Exercisable $ 28.84   $ 25.55   28.84 25.55
Weighted Average Remaining Term, Outstanding 7 years 9 months 15 days 7 years 9 months 26 days 7 years 11 days 6 years 4 months 10 days    
Weighted Average Remaining Term, Exercisable 6 years 8 months 19 days   6 years 6 months 18 days      
Weighted Average Fair Value, Outstanding $ 11.56 $ 10.22 $ 7.51 $ 6.91 11.56 7.51
Weighted Average Fair Value, Exercisable $ 7.75   $ 6.85   $ 7.75 $ 6.85