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SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock price (in dollars per share) $ 24.38   $ 24.38    
Total intrinsic value of all options exercised     $ 38.5 $ 24.4  
Grant date fair value of options, vested     12.7 7.0  
Total unrecognized compensation expense $ 60.7   $ 60.7    
Weighted-average period for recognition of unrecognized compensation expense (in years)     3 years 1 month 21 days    
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price of common stock (as a percent)     85.00%    
Original offering period (in months)     12 months    
New offering period on termination of original offering period (in months)     6 months    
Common shares available for issuance under ESPP (in shares) 0.7   0.7    
Number of shares issued under ESPP (in shares)     0.2   0.2
Employee and non-employee awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 8.3 $ 4.7 $ 18.7 13.5  
Unvested RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation expense $ 13.1   $ 13.1    
Weighted-average period for recognition of unrecognized compensation expense (in years)     3 years 1 month 10 days    
Fair market value on grant date, vested     $ 2.6 1.8  
RSU, fair value     $ 9.8 $ 5.8  
Unvested RSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Unvested RSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years