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Borrowings (Details) - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Sep. 30, 2012
Borrowings      
Amount outstanding $ 55,000    
Term loans 7,924 $ 8,935  
Other long-term debt 2,085 2,422  
Long-term debt 10,009 11,357  
Less current portion of long-term debt 2,752 2,801  
Long-term portion of debt 7,257 $ 8,556  
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 $ 55,000    
Amount outstanding under lines-of-credit $ 6,100    
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      
Variable basis rate LIBOR    
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 lines-of-credit 32,700    
Available credit facility 23,900    
Total cash borrowing sub-limit $ 1,500    
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%