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DEBT AND BORROWINGS - Credit Agreement (Details) - Amended Credit Agreement
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Feb. 06, 2018
USD ($)
Revolving credit facility            
Line of Credit Facility [Line Items]            
Revolving credit facility           $ 1,000,000,000
Line of credit facility outstanding $ 344,969,000 $ 344,969,000   $ 344,969,000 $ 230,000,000  
Letters of credit outstanding 6,394,000 $ 6,394,000   $ 6,394,000    
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    
Interest coverage ratio   4.0 3.75      
Available borrowing capacity $ 648,637,000 $ 648,637,000   $ 648,637,000    
Weighted average interest rate 1.08% 1.08%   1.08%    
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 | Eurocurrency Rate | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.88%          
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%