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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, 2021	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
STOCK-BASED COMPENSATION
Shares, Outstanding, Beginning balance	1,271	1,140	889
Shares, Granted	242	238	257
Shares, Exercised	(68)	(61)	(6)
Shares, Forfeited	(40)	(46)
Shares, Outstanding, Ending balance	1,405	1,271	1,140	889
Shares, Exercisable	938	823
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 44.83	$ 44.01	$ 44.83
Weighted Average Exercise Price, Granted	37.26	44.76	40.54
Weighted Average Exercise Price, Exercised	24.17	26.67	17.19
Weighted Average Exercise Price, Forfeited	57.44	48.47
Weighted Average Exercise Price, Outstanding, Ending balance	44.17	44.83	$ 44.01	$ 44.83
Weighted Average Exercise Price, Exercisable	$ 46.09	$ 45.58
Weighted Average Remaining Term (Years), Outstanding	6 years 10 months 24 days	7 years 2 months 4 days	7 years 6 months 14 days	7 years 10 months 28 days
Weighted Average Remaining Term (Years), Exercisable	5 years 11 months 12 days	6 years 2 months 12 days
Weighted Average Fair Value, Outstanding	$ 10.39	$ 11.06	$ 11.22	$ 11.74
Weighted Average Fair Value, Exercisable	$ 11.58	$ 11.78

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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