FAIR VALUE MEASUREMENTS - FAIR VALUE TABLE (Details) - Recurring - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Level 1
Assets:
Money market funds	$ 5,437	$ 10,709
Foreign currency forward contracts	0	0
Total assets	5,437	10,709
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	2,071	1,401
Total assets	2,844	3,473
Liabilities:
Foreign currency forward contracts	27	2,086
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	10,613	6,114
Level 3
Assets:
Money market funds	0	0
Foreign currency forward contracts	0	0
Total assets	0	0
Liabilities:
Foreign currency forward contracts	0	0
Business Acquisition Contingent Consideration Fair Value Disclosure	42,980	61,340
Option to acquire noncontrolling interests of consolidated subsidiaries	2,950	3,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	45,930	64,340
Interest rate swap | Level 1
Assets:
Interest rate swap agreements	0	0
Liabilities:
Interest rate swap agreements	0	0
Interest rate swap | Level 2
Assets:
Interest rate swap agreements	773	2,072
Liabilities:
Interest rate swap agreements	10,586	4,028
Interest rate swap | Level 3
Assets:
Interest rate swap agreements	0	0
Liabilities:
Interest rate swap agreements	$ 0	$ 0