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STOCK-BASED COMPENSATION - Additional Information (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based payment expense | $ $ 9,003 $ 8,269 $ 13,142
Former Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based payment expense | $   $ 1,300 $ 5,400
2018 Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for issuance (in shares) | shares 3,818,895    
Full value awards, appreciation multiplier 2.0    
Number of shares available for grant (in shares) | shares 3,747,822    
Participants' age required under award vesting terms 62 years    
Employees' age required under award vesting terms 55 years    
Number of years of continuous service to be completed by an employee under award vesting terms 15 years