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Borrowings (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
item
$ / shares
Mar. 29, 2018
$ / shares
Jun. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Borrowings                
Borrowings outstanding   $ 228,000 $ 228,000   $ 103,000      
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   2,511 $ 2,511   3,700      
Other long-term debt   1,506 1,506   1,621      
Total   249,281 249,281   244,146      
Less current portion of long-term debt   (2,252) (2,252)   (2,396)      
Long-term portion of debt   247,029 247,029   241,750      
Revolving Credit Facility                
Borrowings                
Maximum borrowing capacity             $ 525,000 $ 450,000
Sub-limit available for letters of credit   300,000 $ 300,000          
Unused commitment fee (as a percent)     0.20%          
Borrowings outstanding   228,000 $ 228,000          
Amount outstanding under lines-of-credit facilities   33,300 33,300          
Available credit facility   263,700 $ 263,700          
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 $ 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     $ 287,500    
Interest rate (as a percentage)   1.25% 1.25%     1.25%    
Conversion ratio     9.3056          
Conversion price | $ / shares   $ 107.46 $ 107.46          
Premium on stock price   38.50% 38.50%          
Liability component of convertible debt   $ 242,400 $ 242,400          
Equity component of convertible debt   45,100 45,100          
Debt issuance costs   7,700 7,700          
Debt Component of debt issuance costs   6,500 6,500          
Equity component of debt issuance costs   1,200 1,200          
Total interest expense   3,100 9,200          
Contractual interest expense   900 2,700          
Amortization of debt discount   1,900 5,600          
Amortization of debt issuance costs   300 900          
Unamortized debt discount   $ 37,045 $ 37,045   42,602      
Effective interest rate (as a percent)   4.50% 4.50%          
Unamortized debt issuance costs   $ 5,191 $ 5,191   6,073      
Stock price per share | $ / shares       $ 65.27        
Components of long-term debt                
Principal amount   287,500 287,500   287,500      
Unamortized discount   (37,045) (37,045)   (42,602)      
Unamortized debt issuance costs   (5,191) (5,191)   (6,073)      
Total   245,264 245,264   $ 238,825      
Bank lines-of-credit                
Borrowings                
Amount outstanding under lines-of-credit facilities   60,300 60,300          
Available credit facility   $ 12,900 $ 12,900          
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%