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Borrowings (Details) - USD ($)
 1 Months Ended 3 Months Ended
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Sep. 01, 2022
Feb. 28, 2017
BORROWINGS            
Borrowings outstanding   $ 235,000,000   $ 215,000,000    
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)   0.10%        
Borrowings outstanding   $ 235,000,000        
Available credit facility   $ 327,300,000        
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          
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            
Maximum borrowing capacity $ 300,000,000          
Amount outstanding under letters of credit   $ 37,700,000        
Term Loan            
BORROWINGS            
Borrowings outstanding   141,300,000        
1.25% Convertible Senior Notes Due 2022            
BORROWINGS            
Interest rate     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   56,800,000        
Available credit facility   17,600,000        
Credit facility and delayed draw term loan            
BORROWINGS            
Interest rate   $ 6,300,000 $ 2,100,000