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BORROWINGS AND DEBT (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2019
USD ($)
item
$ / shares
Jun. 30, 2018
USD ($)
Apr. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Borrowings            
Borrowings outstanding $ 88,000 $ 113,000        
Components of long-term debt            
Convertible notes 256,495 247,470        
Term loans   2,114        
Other long-term debt 2,061 1,658        
Total 258,556 251,242        
Less current portion of long-term debt (804) (2,262)        
Long-term portion of debt $ 257,752 248,980        
Fiscal year principal payments of long-term debt            
2020   819        
2021   710        
2022   446        
2023   287,586        
Total   289,561        
Revolving Credit Facility            
Borrowings            
Maximum borrowing capacity     $ 535,000 $ 525,000    
Sub limit available for letters of credit           $ 300,000
Unused commitment fee (as a percent) 0.10%          
Borrowings outstanding $ 88,000          
Amount outstanding under lines of credit facilities 55,900          
Available credit facility $ 391,100          
Revolving Credit Facility | Minimum            
Borrowings            
Unused commitment fee (as a percent) 0.10%          
Revolving Credit Facility | Maximum            
Borrowings            
Increase in the credit agreement's borrowing capacity available under certain circumstances     $ 250,000      
Commitment fee (as a percent) 0.25%          
Revolving Credit Facility | LIBOR            
Borrowings            
Interest rate margin (as a percent) 1.00%          
Revolving Credit Facility | LIBOR | Minimum            
Borrowings            
Interest rate margin (as a percent) 1.00%          
Revolving Credit Facility | LIBOR | Maximum            
Borrowings            
Unused commitment fee (as a percent) 1.75%          
1.25% Convertible Senior Notes Due 2022            
Borrowings            
Principal amount $ 287,500       $ 287,500  
Interest rate (as a percentage) 1.25%       1.25%  
Conversion ratio 9.3056          
Conversion price | $ / shares $ 107.46          
Premium on stock price 38.50%          
Threshold percentage of stock price 130.00%          
Number of trading days | item 20          
Number of consecutive trading days | item 30          
Principal amount of the notes to be repurchased (as a percentage) 100.00%          
Liability component of convertible debt $ 242,400          
Equity component of convertible debt 45,100          
Debt issuance costs 7,700          
Debt Component of debt issuance costs 6,500          
Equity component of debt issuance costs   1,200        
Total interest expense 12,600 12,300        
Contractual interest expense 3,600 3,600        
Amortization of debt discount 7,800 7,500        
Amortization of debt issuance costs $ 1,200 1,200        
Effective interest rate (as a percent) 4.50%          
Components of long-term debt            
Principal amount $ 287,500 287,500        
Unamortized discount (27,283) (35,133)        
Unamortized debt issuance costs (3,722) (4,897)        
Bank lines of credit            
Borrowings            
Amount outstanding under lines of credit facilities $ 42,500          
Available credit facility   $ 24,000