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DEBT AND BORROWINGS (Credit Agreement) (Details) - Amended Credit Agreement
3 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
Sep. 30, 2019
USD ($)
Dec. 31, 2019
Feb. 06, 2018
USD ($)
Unsecured revolving credit facility                
Line of Credit Facility [Line Items]                
Revolving credit facility               $ 1,000,000,000
Line of credit facility outstanding     $ 288,000,000 $ 280,000,000        
Letters of credit outstanding     $ 9,698,000          
Write off of unamortized issuance costs           $ 973,000    
Term Loan                
Line of Credit Facility [Line Items]                
Revolving credit facility               300,000,000
Additional borrowing capacity               $ 400,000,000
Consolidated leverage ratio     3.75 4.0 4.50   4.75  
Interest coverage ratio         3.0      
Available borrowing capacity     $ 702,302,000          
Weighted average interest rate     1.52%          
Term Loan | Minimum                
Line of Credit Facility [Line Items]                
Commitment fee percentage     0.20%          
Term Loan | Maximum                
Line of Credit Facility [Line Items]                
Commitment fee percentage     0.45%          
Term Loan | Forecast                
Line of Credit Facility [Line Items]                
Interest coverage ratio 4.0 3.75            
Term Loan | Eurocurrency Rate | Minimum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     0.875%          
Term Loan | Eurocurrency Rate | Maximum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     2.50%          
Term Loan | Base Rate | Minimum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     0.00%          
Term Loan | Base Rate | Maximum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.50%