FAIR VALUE MEASUREMENTS - FAIR VALUE TABLE (Details) - Recurring - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Level 1
Assets:
Money market funds	$ 144,745	$ 89
Foreign currency forward contracts	0	0
Contingent Consideration Receivable - Asset	0	0
Total assets	144,745	89
Liabilities:
Foreign currency forward contracts	0	0
Business Acquisition Contingent Consideration Fair Value Disclosure	0	0
Option to acquire noncontrolling interests of consolidated subsidiaries	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Level 2
Assets:
Money market funds	0	0
Foreign currency forward contracts	1,270	812
Contingent Consideration Receivable - Asset	0	0
Total assets	1,270	812
Liabilities:
Foreign currency forward contracts	724	132
Business Acquisition Contingent Consideration Fair Value Disclosure	0	0
Option to acquire noncontrolling interests of consolidated subsidiaries	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	21,169	13,633
Level 3
Assets:
Money market funds	0	0
Foreign currency forward contracts	0	0
Contingent Consideration Receivable - Asset	668	738
Total assets	668	738
Liabilities:
Foreign currency forward contracts	0	0
Business Acquisition Contingent Consideration Fair Value Disclosure	35,002	42,875
Option to acquire noncontrolling interests of consolidated subsidiaries	2,650	2,900
Financial and Nonfinancial Liabilities, Fair Value Disclosure	37,652	45,775
Interest rate swap | Level 1
Liabilities:
Interest rate swap agreements	0	0
Interest rate swap | Level 2
Liabilities:
Interest rate swap agreements	20,445	13,501
Interest rate swap | Level 3
Liabilities:
Interest rate swap agreements	$ 0	$ 0