STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares shares in Thousands	9 Months Ended		12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
STOCK-BASED COMPENSATION
Shares, Outstanding, Beginning balance	1,271	1,140	1,140
Shares, Granted	172	168
Shares, Exercised	(55)	(59)
Shares, Forfeited	(24)	(38)
Shares, Outstanding, Ending balance	1,364	1,211	1,271	1,140
Shares, Exercisable	865	753
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 44.83	$ 44.01	$ 44.01
Weighted Average Exercise Price, Granted	33.81	46.67
Weighted Average Exercise Price, Exercised	22.69	26.36
Weighted Average Exercise Price, Forfeited	55.61	46.34
Weighted Average Exercise Price, Outstanding, Ending balance	44.14	45.18	$ 44.83	$ 44.01
Weighted Average Exercise Price, Exercisable	$ 46.40	$ 45.81
Weighted Average Remaining Term (Years), Outstanding	6 years 11 months 15 days	7 years 3 months 10 days	7 years 2 months 4 days	7 years 6 months 14 days
Weighted Average Remaining Term (Years), Exercisable	5 years 11 months 19 days	6 years 3 months
Weighted Average Fair Value, Outstanding	$ 10.52	$ 11.27	$ 11.06	$ 11.22
Weighted Average Fair Value, Exercisable	$ 11.76	$ 10.22