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Borrowings (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
USD ($)
Mar. 31, 2017
USD ($)
item
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Borrowings                
Borrowings outstanding   $ 93,000 $ 93,000         $ 125,000
Repurchase of common shares     48,453 $ 73,368        
Repurchase of common stock (in shares) | shares   82,640            
Threshold percentage of stock price   130.00%            
Number of trading days | item   20            
Number of consecutive trading days   30 days            
Principal amount of the notes to be repurchased (as a percentage)   100.00%            
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   $ 93,000 93,000          
Amount outstanding under letters-of-credit   20,700 20,700          
Available credit facility   411,000 411,000          
Repayments of Lines of Credit   $ 245,000            
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%            
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%      
Repurchase of common shares   $ 35,000            
Repurchase of common stock (in shares) | shares   451,600            
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   1,200 1,200          
Contractual interest expense   400 400          
Amortization of debt discount   700 700          
Amortization of debt issuance costs   100 100          
Unamortized debt discount   $ 44,373 $ 44,373          
Effective interest rate (as a percent)   4.50% 4.50%          
Stock price per share | $ / shares   $ 72.99 $ 72.99          
Bank lines-of-credit                
Borrowings                
Amount outstanding under letters-of-credit   $ 48,000 $ 48,000          
Available credit facility   $ 10,300 $ 10,300          
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%