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STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares
shares in Thousands
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
STOCK-BASED COMPENSATION        
Shares, Outstanding, Beginning balance 707 1,064 876  
Shares, Granted 302 270 300  
Shares, Exercised (110) (622) (106)  
Shares, Forfeited (10) (5) (6)  
Shares, Outstanding, Ending balance 889 707 1,064 876
Shares, Exercisable 587      
Weighted Average Exercise Price, Outstanding, Beginning balance $ 39.04 $ 26.38 $ 22.34  
Weighted Average Exercise Price, Granted 53.49 57.88 34.70  
Weighted Average Exercise Price, Exercised 28.81 25.57 17.10  
Weighted Average Exercise Price, Forfeited 71.75 36.73 17.33  
Weighted Average Exercise Price, Outstanding, Ending balance 44.83 $ 39.04 $ 26.38 $ 22.34
Weighted Average Exercise Price, Exercisable $ 40.39      
Weighted Average Remaining Term (Years), Outstanding 7 years 10 months 28 days 7 years 9 months 26 days 6 years 4 months 10 days 7 years 29 days
Weighted Average Remaining Term (Years), Exercisable 7 years 11 days      
Weighted Average Fair Value, Outstanding $ 11.74 $ 10.22 $ 6.91 $ 6.01
Weighted Average Fair Value, Exercisable $ 10.80