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LINE-OF-CREDIT BORROWINGS AND DEBT (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2012
Borrowings      
Amount outstanding $ 125,000    
Term loans 6,847 $ 8,935  
Other long-term debt 1,966 2,422  
Total 8,813 11,357  
Less current portion of long-term debt 2,759 2,801  
Long-term portion of debt 6,054 8,556  
Fiscal year principal payments of long-term debt      
2017 2,759    
2018 2,383    
2019 2,044    
2020 801    
2021 183    
2022 and thereafter 643    
Total 8,813 $ 11,357  
Revolving credit facility      
Borrowings      
Maximum borrowing capacity 450,000    
Sub-limit available for letters of credit 375,000    
Increase in the credit agreement's borrowing capacity available under certain circumstances $ 200,000    
Unused commitment fee (as a percent) 0.20%    
Amount outstanding $ 125,000    
Amount outstanding under letters-of-credit $ 6,200    
Revolving credit facility | Minimum      
Borrowings      
Unused commitment fee (as a percent) 0.20%    
Revolving credit facility | Maximum      
Borrowings      
Unused commitment fee (as a percent) 0.35%    
Revolving credit facility | LIBOR      
Borrowings      
Interest rate margin (as a percent) 1.25%    
Revolving credit facility | LIBOR | Minimum      
Borrowings      
Interest rate margin (as a percent) 1.25%    
Revolving credit facility | LIBOR | Maximum      
Borrowings      
Interest rate margin (as a percent) 2.00%    
Bank lines-of-credit      
Borrowings      
Amount outstanding $ 0    
Amount outstanding under letters-of-credit 37,100    
Available credit facility 19,100    
Total cash borrowing sub-limit $ 1,300    
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%