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BUSINESS COMBINATIONS - Identifiable Intangible Assets (Details) - Saba Software, Inc. - USD ($) $ in Thousands	Apr. 22, 2020	Sep. 30, 2020
Business Acquisition [Line Items]
Intangible assets	$ 481,000	$ 481,000
Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 294,800
Estimated Useful Life (in years)	11 years
Customer contracts
Business Acquisition [Line Items]
Intangible assets	$ 58,500
Estimated Useful Life (in years)	2 years
Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 120,500
Developed technology \| Minimum
Business Acquisition [Line Items]
Estimated Useful Life (in years)	3 years
Developed technology \| Maximum
Business Acquisition [Line Items]
Estimated Useful Life (in years)	5 years
Trade names, trademarks, and domain names
Business Acquisition [Line Items]
Intangible assets	$ 7,200
Estimated Useful Life (in years)	3 years