ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands								8 Months Ended	12 Months Ended
	Oct. 31, 2022	May 31, 2022	Feb. 08, 2022	Sep. 09, 2021	Sep. 01, 2021	Apr. 21, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition
Payments to acquire businesses, net of cash									$ 163,921	$ 2,089,706	$ 1,292
Goodwill								$ 2,359,674	2,489,308	2,359,674	$ 838,428
Rapid Financial Solutions, LLC
Business Acquisition
Cash acquired from acquisition	$ 2,200
Business acquisition consideration	67,700
Payments to acquire businesses, net of cash	51,200
Payment to acquire business, common stock	18,200
Contingent consideration	500
Total tangible assets	2,900
Liabilities assumed	(635)
Goodwill	40,000
Identifiable intangible assets acquired	$ 27,600
Finite-lived intangible asset, useful life (in years)	10 years
Quatred, LLC
Business Acquisition
Payments to acquire businesses, net of cash		$ 637
Arx
Business Acquisition
Business acquisition consideration				$ 12,800
VendEngine
Business Acquisition
Cash acquired from acquisition					$ 1,700
Payments to acquire businesses, net of cash					81,600
Contingent consideration					3,800
Total tangible assets					5,800
Liabilities assumed					(3,000)
Goodwill					54,300
Identifiable intangible assets acquired					37,900
Deferred tax liabilities					9,600
Adjustments related to goodwill									(204)	(4,400)
Cash to acquire business					$ 83,600
VendEngine | Amortization of acquired software
Business Acquisition
Finite-lived intangible asset, useful life (in years)					13 years
VendEngine | Customer Relationships
Business Acquisition
Finite-lived intangible asset, useful life (in years)					13 years
VendEngine | Trade names
Business Acquisition
Finite-lived intangible asset, useful life (in years)					13 years
Corporate
Business Acquisition
Cash acquired from acquisition						$ 331,800
Payments to acquire businesses, net of cash						2,000,000
Contingent consideration						1,900
Total tangible assets						515,300
Liabilities assumed						(228,000)
Goodwill						1,446,868
Identifiable intangible assets acquired						$ 777,000
Finite-lived intangible asset, useful life (in years)						17 years
Deferred tax liabilities						$ 190,596
Adjustments related to goodwill										(17,200)
Financial advisory and legal fees										23,500
Cash to acquire business						$ 2,300,000
Revenue of acquiree, actual								368,900
Loss of acquiree, actual								$ 37,200
Severance costs										$ 1,600
Readysub
Business Acquisition
Payments to acquire businesses, net of cash							$ 6,200
DataSpec
Business Acquisition
Cash to acquire business							$ 5,800
US eDirect Inc
Business Acquisition
Cash acquired from acquisition			$ 6,400
Business acquisition consideration			116,500
Payments to acquire businesses, net of cash			118,800
Contingent consideration			4,100
Total tangible assets			9,400
Liabilities assumed			(3,700)
Goodwill			91,400
Identifiable intangible assets acquired			$ 34,100
Finite-lived intangible asset, useful life (in years)			13 years
Deferred tax liabilities			$ 8,326
Adjustments related to goodwill									10,300
Financial advisory and legal fees									$ 2,000