BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands			1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Aug. 23, 2019	Dec. 31, 2019	Dec. 31, 2020	Mar. 31, 2020
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]
Goodwill	$ 126,945			$ 126,945	$ 118,097
Systems Management Planning (SMP) [Member]
Business Combination [Abstract]
Cash portion of the acquisition	29,300
Receivable related to working capital adjustment	2,200			2,200
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]
Accounts receivable	14,329			14,329
Other assets	3,290			3,290
Identified intangible assets	14,270			14,270
Accounts payable and other current liabilities	(11,250)			(11,250)
Performance obligation	(2,180)			(2,180)
Total identifiable net assets	18,459			18,459
Goodwill	8,643			8,643
Total purchase consideration	27,102			27,102
Systems Management Planning (SMP) [Member] | Customer Relationships [Member]
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]
Identified intangible assets	$ 14,300			$ 14,300
Estimated useful lives				7 years
ABS Technology [Member]
Business Combination [Abstract]
Cash portion of the acquisition		$ 13,800
Receivable related to working capital adjustment		200
Contingent consideration payable		1,700
Additional cash paid upon collection of certain accounts receivable					$ 1,700
Repayment from acquiree			$ 200
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]
Accounts receivable		9,208
Other assets		743
Identified intangible assets		5,720
Accounts payable and other current liabilities		(6,715)
Performance obligation		(1,140)
Total identifiable net assets		7,816
Goodwill		7,461
Total purchase consideration		$ 15,277
ABS Technology [Member] | Customer Relationships [Member]
Allocation of Purchase Price Consideration to Assets Acquired and Liabilities Assumed [Abstract]
Estimated useful lives				7 years