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SPECIAL CHARGES (RECOVERIES) - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]      
Acquisition-related costs $ 6,872 $ 5,906 $ 13,750
Other charges (recoveries) 18,115 1,155 5,011
Zix Corporation      
Restructuring Cost and Reserve [Line Items]      
Acquisition-related costs 2,900    
Pre-acquisition equity incentives | Zix Corporation      
Restructuring Cost and Reserve [Line Items]      
Other charges (recoveries) 15,400    
Miscellaneous other charges      
Restructuring Cost and Reserve [Line Items]      
Other charges (recoveries) 2,700 1,200 4,300
Accelerated Amortization      
Restructuring Cost and Reserve [Line Items]      
Other charges (recoveries)     700
Fiscal 2022 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) 25,778 0 0
Special charges recorded to date 25,800    
Fiscal 2022 Restructuring Plan | Minimum      
Restructuring Cost and Reserve [Line Items]      
Expected cost 32,000    
Fiscal 2022 Restructuring Plan | Maximum      
Restructuring Cost and Reserve [Line Items]      
Expected cost 37,000    
Fiscal 2022 Restructuring Plan | Abandoned facilities      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) 23,500    
Fiscal 2022 Restructuring Plan | Reversal of lease liabilities      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) (17,800)    
COVID-19 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) (3,625) (8,929) 53,616
Special charges recorded to date 41,100    
COVID-19 Restructuring Plan | Reversal of lease liabilities      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   (12,500)  
COVID-19 Restructuring Plan | Abandoned facilities and workforce reductions      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) (3,600)    
COVID-19 Restructuring Plan | Lease terminated early or assigned to third party      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   (16,000)  
COVID-19 Restructuring Plan | Abandoned facilities, workforce reductions and write-off of fixed assets      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   7,100  
Fiscal 2020 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) (128) 3,669 $ 26,680
Special charges recorded to date 30,200    
Fiscal 2020 Restructuring Plan | Reversal of lease liabilities      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   (10,100)  
Fiscal 2020 Restructuring Plan | Abandoned facilities and workforce reductions      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries) $ (100)    
Fiscal 2020 Restructuring Plan | Lease terminated early or assigned to third party      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   (13,500)  
Fiscal 2020 Restructuring Plan | Abandoned facilities, workforce reductions and write-off of fixed assets      
Restructuring Cost and Reserve [Line Items]      
Special charges (recoveries)   $ 17,200