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Borrowings (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
item
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
$ / shares
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Feb. 28, 2017
USD ($)
Borrowings            
Borrowings outstanding $ 91,000   $ 91,000   $ 88,000  
Number of consecutive trading days | item 30          
Components of long-term debt            
Other long-term debt $ 2,022   2,022   2,061  
Total 263,163   263,163   258,556  
Less current portion of long-term debt (837)   (837)   (804)  
Long-term portion of debt 262,326   262,326   257,752  
Revolving Credit Facility            
Borrowings            
Maximum borrowing capacity 535,000   535,000      
Sub-limit available for letters of credit 300,000   $ 300,000      
Unused commitment fee (as a percent)     0.10%      
Borrowings outstanding 91,000   $ 91,000      
Amount outstanding under letters of credit 53,700   53,700      
Available credit facility 390,300   $ 390,300      
Revolving Credit Facility | Minimum            
Borrowings            
Unused commitment fee (as a percent)     0.10%      
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)     0.25%      
Revolving Credit Facility | LIBOR            
Borrowings            
Interest rate margin (as a percent)     1.00%      
Revolving Credit Facility | LIBOR | Minimum            
Borrowings            
Interest rate margin (as a percent)     1.00%      
Revolving Credit Facility | LIBOR | Maximum            
Borrowings            
Interest rate margin (as a percent)     1.75%      
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%      
Threshold percentage of stock price 130.00%   130.00%      
Number of trading days | item 20   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   $ 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 3,200 $ 3,200 6,400 $ 6,300    
Contractual interest expense 900 900 1,800 1,800    
Amortization of debt discount 2,000 2,000 4,000 3,900    
Amortization of debt issuance costs 300 $ 300 600 $ 600    
Unamortized discount $ (23,225)   $ (23,225)   (27,283)  
Effective interest rate (as a percent) 4.50%   4.50%      
Unamortized debt issuance costs $ 3,134   $ 3,134   3,722  
Components of long-term debt            
Principal amount 287,500   287,500   287,500  
Unamortized discount (23,225)   (23,225)   (27,283)  
Unamortized debt issuance costs (3,134)   (3,134)   (3,722)  
Total 261,141   261,141   $ 256,495  
Bank lines of credit            
Borrowings            
Amount outstanding under letters of credit 49,800   49,800      
Available credit facility $ 18,600   $ 18,600