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STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares
shares in Thousands
3 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Apr. 30, 2019
Jan. 31, 2019
STOCK-BASED COMPENSATION        
Shares, Outstanding, Beginning balance 1,271   1,140  
Shares, Granted 172   92  
Shares, Exercised (10)   (59)  
Shares, Forfeited (2)   (14)  
Shares, Outstanding, Ending balance 1,431 1,271 1,159 1,140
Shares, Exercisable 874   729  
Weighted Average Exercise Price, Outstanding, Beginning balance $ 44.83   $ 44.01  
Weighted Average Exercise Price, Granted 33.81   50.30  
Weighted Average Exercise Price, Exercised 17.67   26.36  
Weighted Average Exercise Price, Forfeited 46.35   51.13  
Weighted Average Exercise Price, Outstanding, Ending balance 43.69 $ 44.83 45.34 $ 44.01
Weighted Average Exercise Price, Exercisable $ 45.78   $ 45.90  
Weighted Average Remaining Term (Years), Outstanding 7 years 3 months 29 days 7 years 2 months 5 days 7 years 7 months 21 days 7 years 6 months 15 days
Weighted Average Remaining Term (Years), Exercisable 6 years 2 months 1 day   6 years 8 months 1 day  
Weighted Average Fair Value, Outstanding $ 10.45 $ 11.06 $ 11.42 $ 11.22
Weighted Average Fair Value, Exercisable $ 11.74   $ 11.97