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ACQUISITIONS - Acquisition of Zix, Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 23, 2021
Business Acquisition [Line Items]      
Goodwill $ 5,226,814 $ 5,244,653  
Zix Corporation      
Business Acquisition [Line Items]      
Current assets (inclusive of cash acquired of $38.3 million)     $ 74,230
Cash acquired     38,300
Non-current tangible assets     13,450
Liabilities assumed     (79,941)
Total identifiable net assets     312,789
Goodwill     581,672
Net assets acquired     894,461
Zix Corporation | Customer assets      
Business Acquisition [Line Items]      
Intangible assets     212,400
Zix Corporation | Technology assets      
Business Acquisition [Line Items]      
Intangible assets     $ 92,650