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Borrowings (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2018
USD ($)
item
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Borrowings              
Borrowings outstanding   $ 166,000   $ 113,000      
Components of long-term debt              
Term loans   1,718   2,114      
Other long-term debt   1,876   1,658      
Total   253,284   251,242      
Less current portion of long-term debt   (2,326)   (2,262)      
Long-term portion of debt   250,958   248,980      
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   $ 166,000          
Amount outstanding under lines of credit facilities   59,100          
Available credit facility   $ 299,900          
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)   1.50%          
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%          
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%          
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%          
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   3,100 $ 3,000        
Contractual interest expense   900 900        
Amortization of debt discount   1,900 1,800        
Amortization of debt issuance costs   300 $ 300        
Unamortized debt discount   $ 33,206   35,133      
Effective interest rate (as a percent)   4.50%          
Unamortized debt issuance costs   $ 4,604   4,897      
Stock price per share | $ / shares   $ 76.31          
Components of long-term debt              
Principal amount   $ 287,500   287,500      
Unamortized discount   (33,206)   (35,133)      
Unamortized debt issuance costs   (4,604)   (4,897)      
Total   249,690   $ 247,470      
Bank lines of credit              
Borrowings              
Amount outstanding under lines of credit facilities   60,400          
Available credit facility   $ 7,900          
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%