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Debt (Details) - Five-year revolving credit agreement - Senior secured debt - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2019
Sep. 30, 2021
Jun. 30, 2021
Debt      
Term of credit agreement 5 years    
Maximum borrowing capacity $ 250,000    
Maximum borrowing capacity, subject to additional lender commitments and satisfaction of other requirements $ 375,000    
Outstanding borrowings   $ 0 $ 0
Minimum      
Debt      
Interest coverage ratio 3.00    
Maximum      
Debt      
Net total leverage ratio 4.00    
Net senior secured leverage ratio 3.50    
LIBOR | Minimum      
Debt      
Margin on base rate 0.875%    
LIBOR | Maximum      
Debt      
Margin on base rate 1.375%    
Adjusted base rate | Minimum      
Debt      
Margin on base rate 0.00%    
Adjusted base rate | Maximum      
Debt      
Margin on base rate 0.375%