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Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2016
Nov. 30, 2016
Jun. 30, 2016
Borrowings      
Borrowings outstanding $ 349,000   $ 125,000
Term loans 5,844   6,847
Other long-term debt 1,642   1,966
Total 7,486   8,813
Less current portion of long-term debt (2,565)   (2,759)
Long-term portion of debt 4,921   $ 6,054
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 $ 349,000    
Amount outstanding under letters-of-credit 23,000    
Available credit facility $ 153,000    
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    
Unused 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      
Interest rate margin (as a percent) 2.00%    
Bank lines-of-credit      
Borrowings      
Amount outstanding under letters-of-credit $ 42,600    
Available credit facility 10,000    
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      
Variable basis rate LIBOR    
Interest rate margin (as a percent) 1.25%