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STOCK-BASED COMPENSATION - Additional Information (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based payment expense | $ $ 8,269 $ 13,142 $ 9,797
2016 Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for issuance (in shares) | shares 3,500,000    
Full value awards, appreciation multiplier 2.4    
Number of shares available for grant (in shares) | shares 4,500,278    
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    
Former Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based payment expense | $ $ 1,300 $ 5,400