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BORROWINGS (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Sep. 01, 2022
Feb. 28, 2017
BORROWINGS            
Borrowings outstanding   $ 215,000,000 $ 60,000,000      
Increase to retained earnings   735,957,000 663,869,000      
Reduction in common stock   $ 9,835,000 17,000      
Principal value of notes repurchased and cancelled         $ 242,300,000  
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   $ 215,000,000.0        
Available credit facility   $ 336,500,000        
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 lines of credit facilities   $ 48,500,000        
1.25% Convertible Senior Notes Due 2022            
BORROWINGS            
Principal amount           $ 287,500,000
Interest rate (as a percentage)   1.25%        
Debt component of debt issuance costs   $ 6,500,000        
Equity component of debt issuance costs   1,200,000        
Total interest expense     4,700,000 $ 13,400,000    
Contractual interest expense   500,000 3,500,000 3,600,000    
Amortization of debt discount   200,000 $ 1,200,000 8,600,000    
Amortization of debt issuance costs   700,000   $ 1,200,000    
Debt issuance costs   7,700,000        
Lines-of-credit            
BORROWINGS            
Amount outstanding under lines of credit facilities   51,700,000        
Available credit facility   24,500,000        
Term Loan            
BORROWINGS            
Borrowings outstanding   $ 143,100,000