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STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares
shares in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
STOCK-BASED COMPENSATION        
Shares, Outstanding, Beginning balance 1,078   1,140 889
Shares, Granted     168 192
Shares, Exercised     (59) (3)
Shares, Forfeited     (38)  
Shares, Exercisable     753 709
Shares, Outstanding, Ending balance 1,140 889 1,211 1,078
Weighted Average Exercise Price, Outstanding, Beginning balance $ 44.11   $ 44.01 $ 44.83
Weighted Average Exercise Price, Granted     46.67 40.32
Weighted Average Exercise Price, Exercised     26.36 17.33
Weighted Average Exercise Price, Forfeited     46.34  
Weighted Average Exercise Price, Exercisable     45.81 44.57
Weighted Average Exercise Price, Outstanding, Ending balance $ 44.01 $ 44.83 $ 45.18 $ 44.11
Weighted Average Remaining Term (Years), Outstanding 7 years 6 months 15 days 7 years 10 months 28 days 7 years 3 months 11 days 7 years 7 months 17 days
Weighted Average Remaining Term (Years), Exercisable     6 years 3 months 6 years 8 months 9 days
Weighted Average Fair Value, Outstanding $ 11.22 $ 11.74 $ 11.27 $ 11.33
Weighted Average Fair Value, Exercisable     $ 10.22 $ 11.77