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Borrowings (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2023
Sep. 01, 2022
Dec. 31, 2021
Feb. 28, 2017
BORROWINGS                
Borrowings outstanding $ 316,000,000   $ 316,000,000   $ 215,000,000      
Revolving credit facility                
BORROWINGS                
Unused commitment fee (as a percent)     0.10%          
Borrowings outstanding 316,000,000.0   $ 316,000,000.0          
Available credit facility 230,000,000.0   $ 230,000,000.0          
Revolving credit facility | Minimum                
BORROWINGS                
Maximum borrowing capacity             $ 600,000,000  
Unused commitment fee (as a percent)     0.10%          
Revolving credit facility | Maximum                
BORROWINGS                
Maximum borrowing capacity             300,000,000  
Increase in the credit agreement's borrowing capacity available under certain circumstances             $ 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 54,000,000.0   $ 54,000,000.0          
Term Loan                
BORROWINGS                
Borrowings outstanding 139,400,000   139,400,000          
1.25% Convertible Senior Notes Due 2022                
BORROWINGS                
Total interest expense   $ 0   $ 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 57,500,000   57,500,000          
Available credit facility 19,000,000.0   19,000,000.0          
Credit facility and delayed draw term loan                
BORROWINGS                
Total interest expense $ 7,000,000.0 $ 5,000,000.0 $ 13,300,000 $ 7,100,000