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Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2012
Borrowings        
Amount outstanding   $ 339,000 $ 125,000  
Term loans   6,370 6,847  
Other long-term debt   1,934 1,966  
Total   8,304 8,813  
Less current portion of long-term debt   (2,681) (2,759)  
Long-term portion of debt   5,623 $ 6,054  
Revolving credit facility        
Borrowings        
Maximum borrowing capacity   450,000    
Sub-limit available for letters of credit   $ 375,000    
Unused commitment fee (as a percent) 0.30% 0.20%    
Amount outstanding   $ 339,000    
Amount outstanding under letters-of-credit   $ 33,200    
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   $ 200,000    
Unused commitment fee (as a percent)   0.35%    
Revolving credit facility | LIBOR        
Borrowings        
Interest rate margin (as a percent) 1.75% 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   38,500    
Available credit facility   16,600    
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        
Variable basis rate   LIBOR    
Interest rate margin (as a percent)   1.25%