SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, beginning of year	$ 5,324	$ 3,777	$ 2,217
Provision for doubtful accounts	3,707	2,572	2,746
Amounts written off	(3,853)	(1,176)	(1,172)
Other, including fluctuations in foreign exchange rates	(22)	151	(14)
Allowance for doubtful accounts, end of year	6,168	5,324	3,777
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, beginning of year	1,012	0	0
Allowance for doubtful accounts, end of year	$ 1,100	$ 1,012	$ 0