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Borrowings (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2017
USD ($)
item
$ / shares
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Borrowings              
Borrowings outstanding   $ 214,000   $ 103,000      
Repurchase of common shares     $ 2,712        
Threshold percentage of stock price   130.00%          
Number of trading days | item   20          
Number of consecutive trading days | item   30          
Principal amount of the notes to be repurchased (as a percentage)   100.00%          
Components of long-term debt              
Term loans   $ 3,304   3,700      
Other long-term debt   1,476   1,621      
Total   245,702   244,146      
Less current portion of long-term debt   (2,286)   (2,396)      
Long-term portion of debt   243,416   241,750      
Revolving Credit Facility              
Borrowings              
Maximum borrowing capacity           $ 525,000 $ 450,000
Sub-limit available for letters of credit   $ 300,000          
Interest rate margin (as a percent)   1.50%          
Unused commitment fee (as a percent)   0.20%          
Borrowings outstanding   $ 214,000          
Amount outstanding under letters-of-credit   33,100          
Available credit facility   $ 277,900          
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)   1.25%          
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%          
1.25% Convertible Senior Notes Due 2022              
Borrowings              
Principal amount   $ 287,500     $ 287,500    
Interest rate (as a percentage)   1.25%     1.25%    
Conversion ratio   9.3056          
Conversion price | $ / shares   $ 107.46          
Premium on stock price   38.50%          
Liability component of convertible debt   $ 242,400          
Equity component of convertible debt   45,100          
Debt issuance costs   7,700          
Debt Component of debt issuance costs   6,500          
Equity component of debt issuance costs   1,200          
Total interest expense   3,000          
Contractual interest expense   900          
Amortization of debt discount   1,800          
Amortization of debt issuance costs   300          
Unamortized debt discount   $ 40,799   42,602      
Effective interest rate (as a percent)   4.50%          
Unamortized debt issuance costs   $ 5,779   6,073      
Stock price per share | $ / shares   $ 91.37          
Components of long-term debt              
Principal amount   $ 287,500   287,500      
Unamortized discount   (40,799)   (42,602)      
Unamortized debt issuance costs   (5,779)   (6,073)      
Total   240,922   $ 238,825      
Bank lines-of-credit              
Borrowings              
Amount outstanding under letters-of-credit   61,100          
Available credit facility   $ 13,600          
Seven-year term loan due in fiscal 2020              
Borrowings              
Principal amount $ 11,100            
Effective interest rate (as a percent) 2.20%            
Term of loan 7 years            
Seven-year term loan due in fiscal 2020 | LIBOR              
Borrowings              
Interest rate margin (as a percent) 1.25%