FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021	Oct. 31, 2020
Level 1
Assets:
Money market funds	$ 147,029	$ 342,090
Foreign currency forward contracts	0	0
Contingent consideration receivable	0	0
Total assets	147,029	342,090
Liabilities:
Foreign currency forward contracts	0	0
Interest rate swap agreements		0
Future tranche right		0
Contingent consideration - business combinations	0	0
Option to acquire noncontrolling interests of consolidated subsidiaries	0	0
Total liabilities	0	0
Level 2
Assets:
Money market funds	0	0
Foreign currency forward contracts	143	136
Contingent consideration receivable	0	0
Total assets	143	136
Liabilities:
Foreign currency forward contracts	3	48
Interest rate swap agreements		17,881
Future tranche right		0
Contingent consideration - business combinations	0	0
Option to acquire noncontrolling interests of consolidated subsidiaries	0	0
Total liabilities	3	17,929
Level 3
Assets:
Money market funds	0	0
Foreign currency forward contracts	0	0
Contingent consideration receivable	329	565	$ 600
Total assets	329	565
Liabilities:
Foreign currency forward contracts	0	0
Interest rate swap agreements		0
Future tranche right		52,772
Contingent consideration - business combinations	7,615	15,704
Option to acquire noncontrolling interests of consolidated subsidiaries	4,000	3,250
Total liabilities	$ 11,615	$ 71,726