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Borrowings (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2014
Revolving credit facility
Sep. 30, 2014
Revolving credit facility
Minimum
Sep. 30, 2014
Revolving credit facility
Maximum
Sep. 30, 2014
Revolving credit facility
LIBOR
Sep. 30, 2014
Revolving credit facility
LIBOR
Minimum
Sep. 30, 2014
Revolving credit facility
LIBOR
Maximum
Sep. 30, 2014
Bank lines-of-credit
Sep. 30, 2014
Seven-year term loan due in fiscal 2020
Sep. 30, 2012
Seven-year term loan due in fiscal 2020
Sep. 30, 2014
Seven-year term loan due in fiscal 2020
LIBOR
Borrowings                        
Maximum borrowing capacity     $ 450,000,000                  
Sub-limit available for letters of credit     375,000,000                  
Increase in the credit agreement's borrowing capacity available under certain circumstances     200,000,000                  
Variable basis rate           LIBOR           LIBOR
Interest rate margin (as a percent)           1.25% 1.25% 2.00%       1.25%
Unused commitment fee (as a percent)     0.20% 0.20% 0.35%              
Amount outstanding 30,000,000 24,000,000 30,000,000           0      
Amount outstanding under lines-of-credit     100,100,000           11,600,000      
Available credit facility                 26,400,000      
Total cash borrowing sub-limit                 2,900,000      
Principal amount                     11,100,000  
Term of loan                   7 years    
Effective interest rate (as a percent)                   2.20%    
Term loans 11,607,000 10,921,000                    
Other long-term debt 2,480,000 2,334,000                    
Long-term debt 14,087,000 13,255,000                    
Less current portion of long-term debt 2,820,000 2,819,000                    
Long-term portion of debt $ 11,267,000 $ 10,436,000