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Debt - Credit Agreement, Additional Information (Details)
3 Months Ended
Aug. 31, 2018
USD ($)
covenant
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity $ 175,000,000.0    
Commitment fee percentage 0.15%    
Commitment fee percentage on unused capacity 0.30%    
Number of financial covenants | covenant 2    
Ratio of indebtedness to net capital 3.50    
Consolidated fixed charge coverage ratio 1.25    
Interest expense, debt   $ 200,000 $ 1,000,000.0
Maximum      
Debt Instrument [Line Items]      
Ratio of indebtedness to net capital 4.50    
Fed Funds Effective Rate Overnight Index Swap Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   0.005%  
Base Rate      
Debt Instrument [Line Items]      
Stated interest rate 1.00%    
Base Rate | Minimum      
Debt Instrument [Line Items]      
Stated interest rate 0.75%    
Base Rate | Maximum      
Debt Instrument [Line Items]      
Stated interest rate 1.50%    
London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.00%  
Stated interest rate 2.00%    
London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Stated interest rate 1.75%    
London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Stated interest rate 2.50%    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, term   5 years  
Interest expense, debt   $ 200,000 $ 600,000