INCOME TAXES - Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Income Taxes [Line Items]
GILTI net tax impact	$ 100
Deferred tax liabilities related to intangible assets	13,602	$ 21,742
Deferred tax liability tax benefit	6,100
Undistributed earnings of foreign subsidiaries	$ 85,000
Tax Cuts And Jobs Act Of 2017 Measurement Period Adjustment Increase Decrease In Effective Tax Rate	(3.9)	(18.7)
Corporate income tax rate	21.00%	21.00%	33.80%	35.00%
Valuation allowance of deferred tax assets	$ 1,900
Decrease in unrecognized tax position reserve for current year accrual of interest and penalties	2,100
SWITZERLAND
Income Taxes [Line Items]
Deferred tax liabilities related to intangible assets	$ 7,900	$ 15,100