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SPECIAL CHARGES (RECOVERIES) - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]    
Acquisition-related costs $ 4,585 $ 728
Other charges (recoveries) 4,054 218
Zix Corporation    
Restructuring Cost and Reserve [Line Items]    
Acquisition-related costs 200  
Pre-acquisition equity incentives | Zix Corporation    
Restructuring Cost and Reserve [Line Items]    
Other charges (recoveries) 3,600  
Miscellaneous other charges    
Restructuring Cost and Reserve [Line Items]    
Other charges (recoveries) 500 200
Fiscal 2022 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Special charges (recoveries) 6,110 $ 0
Special charges recorded to date 31,900  
Fiscal 2022 Restructuring Plan | Minimum    
Restructuring Cost and Reserve [Line Items]    
Expected cost 40,000  
Fiscal 2022 Restructuring Plan | Maximum    
Restructuring Cost and Reserve [Line Items]    
Expected cost 45,000  
Fiscal 2022 Restructuring Plan | Abandoned facilities    
Restructuring Cost and Reserve [Line Items]    
Special charges (recoveries) 3,800  
Fiscal 2022 Restructuring Plan | Reversal of lease liabilities    
Restructuring Cost and Reserve [Line Items]    
Special charges (recoveries) $ 2,900