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LINE-OF-CREDIT BORROWINGS AND DEBT (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2012
USD ($)
Jun. 30, 2018
USD ($)
item
$ / shares
Jun. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Borrowings            
Borrowings outstanding   $ 113,000 $ 103,000      
Components of long-term debt            
Convertible notes   247,470 238,825      
Term loans   2,114 3,700      
Other long-term debt   1,658 1,621      
Total   251,242 244,146      
Less current portion of long-term debt   (2,262) (2,396)      
Long-term portion of debt   248,980 241,750      
Fiscal year principal payments of long-term debt            
2019   2,262        
2020   1,100        
2021   346        
2022   64        
2023   287,500        
Total   $ 291,272        
Revolving Credit Facility            
Borrowings            
Maximum borrowing capacity         $ 525,000 $ 450,000
Sub-limit available for letters of credit         300,000  
Unused commitment fee (as a percent)   0.20%        
Borrowings outstanding   $ 113,000        
Amount outstanding under lines-of-credit facilities   58,200        
Available credit facility   $ 353,800        
Revolving Credit Facility | Minimum            
Borrowings            
Unused commitment fee (as a percent)   0.20%        
Revolving Credit Facility | Maximum            
Borrowings            
Increase in the credit agreement's borrowing capacity available under certain circumstances         $ 250,000  
Commitment fee (as a percent)   0.30%        
Revolving Credit Facility | LIBOR            
Borrowings            
Interest rate margin (as a percent)   1.50%        
Revolving Credit Facility | LIBOR | Minimum            
Borrowings            
Interest rate margin (as a percent)   1.25%        
Revolving Credit Facility | LIBOR | Maximum            
Borrowings            
Unused commitment fee (as a percent)   2.00%        
1.25% Convertible Senior Notes Due 2022            
Borrowings            
Principal amount   $ 287,500   $ 287,500    
Interest rate (as a percentage)       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   12,300 4,100      
Contractual interest expense   3,600 1,200      
Amortization of debt discount   7,500 2,500      
Amortization of debt issuance costs   $ 1,200 400      
Effective interest rate (as a percent)   4.50%        
Stock price per share | $ / shares   $ 77.33        
Components of long-term debt            
Principal amount   $ 287,500 287,500      
Unamortized discount   (35,133) (42,602)      
Unamortized debt issuance costs   (4,897) $ (6,073)      
Bank letters-of-credit            
Borrowings            
Amount outstanding under lines-of-credit facilities   56,400        
Available credit facility   $ 11,700        
Seven-year term loan due in fiscal 2020            
Borrowings            
Principal amount $ 11,100          
Term of loan 7 years          
Effective interest rate (as a percent) 2.20%          
Seven-year term loan due in fiscal 2020 | LIBOR            
Borrowings            
Interest rate margin (as a percent) 1.25%