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Borrowings (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2021
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 01, 2022
Jun. 30, 2022
Feb. 28, 2017
Borrowings                
Borrowings outstanding   $ 215,000,000   $ 215,000,000     $ 60,000,000  
Contractual interest expense       $ 500,000        
Revolving credit facility                
Borrowings                
Maximum borrowing capacity $ 600,000,000              
Credit facility under term loan 150,000,000              
Unused commitment fee (as a percent)       0.15%        
Borrowings outstanding   215,000,000   $ 215,000,000        
Available credit facility   323,700,000   $ 323,700,000        
Revolving credit facility | Minimum                
Borrowings                
Maximum borrowing capacity 535,000,000              
Unused commitment fee (as a percent)       0.10%        
Revolving credit facility | Maximum                
Borrowings                
Maximum borrowing capacity $ 750,000,000              
Increase in the credit agreement's borrowing capacity available under certain circumstances     $ 250,000,000   $ 250,000,000      
Unused commitment fee (as a percent)       0.25%        
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)       1.00%        
Revolving credit facility | LIBOR | Maximum                
Borrowings                
Interest rate margin (as a percent)       1.75%        
Letters of credit sub facility                
Borrowings                
Maximum borrowing capacity     300,000,000   300,000,000      
Amount outstanding under letters of credit   61,300,000   $ 61,300,000        
Term Loan                
Borrowings                
Borrowings outstanding   $ 145,000,000   $ 145,000,000        
1.25% Convertible Senior Notes Due 2022                
Borrowings                
Principal amount               $ 287,500,000
Interest rate (as a percentage)   1.25%   1.25%        
Principal value of notes repurchased and cancelled           $ 242,300,000    
Debt issuance costs   $ 7,700,000   $ 7,700,000        
Debt component of debt issuance costs   6,500,000   6,500,000        
Equity component of debt issuance costs   1,200,000   1,200,000        
Total interest expense   0 1,200,000 700,000 3,700,000      
Contractual interest expense     900,000 500,000 2,700,000      
Amortization of debt issuance costs     $ 300,000 200,000 $ 1,000,000.0      
Bank lines-of-credit                
Borrowings                
Amount outstanding under letters of credit   50,100,000   50,100,000        
Available credit facility   $ 27,700,000   $ 27,700,000