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SPECIAL CHARGES (RECOVERIES) - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]        
Acquisition-related costs $ 1,302 $ 3,145 $ 5,967 $ 4,593
Other charges (recoveries) 9,742 265 15,680 1,098
Zix Corporation        
Restructuring Cost and Reserve [Line Items]        
Acquisition-related costs 600   2,700  
Miscellaneous other charges        
Restructuring Cost and Reserve [Line Items]        
Other charges (recoveries) 100 300 4,100 1,100
Pre-acquisition equity incentives | Zix Corporation        
Restructuring Cost and Reserve [Line Items]        
Other charges (recoveries) 9,600   11,600  
Fiscal 2022 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) 464 0 464 0
Special charges recorded to date 500   500  
Fiscal 2022 Restructuring Plan | Minimum        
Restructuring Cost and Reserve [Line Items]        
Expected cost 30,000   30,000  
Fiscal 2022 Restructuring Plan | Maximum        
Restructuring Cost and Reserve [Line Items]        
Expected cost 35,000   35,000  
Fiscal 2022 Restructuring Plan | Workforce reduction        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) 500   500  
COVID-19 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) (495) 153 (1,310) (7,581)
Special charges recorded to date 43,400   43,400  
COVID-19 Restructuring Plan | Abandoned facilities and workforce reductions        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) (500)   (1,300)  
COVID-19 Restructuring Plan | Lease terminated early or assigned to third party        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   (1,500)   (15,400)
COVID-19 Restructuring Plan | Reversal of lease liabilities        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   (2,200)   (12,300)
COVID-19 Restructuring Plan | Abandoned facilities, workforce reductions and write-off of fixed assets        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   1,600   7,800
Fiscal 2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) 3 (727) (145) 475
Special charges recorded to date 30,200   30,200  
Fiscal 2020 Restructuring Plan | Abandoned facilities and workforce reductions        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries) $ 0   $ (100)  
Fiscal 2020 Restructuring Plan | Lease terminated early or assigned to third party        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   (600)   (13,600)
Fiscal 2020 Restructuring Plan | Reversal of lease liabilities        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   (1,000)   (10,000)
Fiscal 2020 Restructuring Plan | Abandoned facilities, workforce reductions and write-off of fixed assets        
Restructuring Cost and Reserve [Line Items]        
Special charges (recoveries)   $ (100)   $ 14,100