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Borrowings (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Sep. 01, 2022
Feb. 28, 2017
BORROWINGS              
Borrowings outstanding $ 349,000,000   $ 349,000,000   $ 215,000,000    
Revolving credit facility              
BORROWINGS              
Unused commitment fee (as a percent)     0.10%        
Borrowings outstanding 349,000,000.0   $ 349,000,000.0        
Available credit facility 176,300,000   176,300,000        
Revolving credit facility | Minimum              
BORROWINGS              
Maximum borrowing capacity 600,000,000   $ 600,000,000        
Unused commitment fee (as a percent)     0.10%        
Revolving credit facility | Maximum              
BORROWINGS              
Maximum borrowing capacity 300,000,000   $ 300,000,000        
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)     1.00%        
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%        
Letters of credit sub facility              
BORROWINGS              
Amount outstanding under letters of credit 74,700,000   $ 74,700,000        
Term Loan              
BORROWINGS              
Borrowings outstanding 137,500,000   137,500,000        
1.25% Convertible Senior Notes Due 2022              
BORROWINGS              
Total interest expense       $ 700,000      
Principal amount             $ 287,500,000
Principal value of notes repurchased and cancelled           $ 242,300,000  
Contractual interest expense       500,000      
Amortization of debt issuance costs       200,000      
Lines-of-credit              
BORROWINGS              
Amount outstanding under letters of credit 54,500,000   54,500,000        
Available credit facility 21,400,000   21,400,000        
Credit facility and delayed draw term loan              
BORROWINGS              
Total interest expense $ 8,100,000 $ 5,900,000 $ 21,500,000 $ 12,900,000