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Long-term Debt - Revolving Facility (Details) - USD ($)
12 Months Ended
Aug. 23, 2018
Mar. 31, 2020
Mar. 31, 2019
Line of Credit Facility [Line Items]      
Aggregate principal amount outstanding   $ 521,125,000  
Revolving Facility | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 60,000,000.0    
Commitment fee percentage 0.25%    
Fronting fee percentage 0.125%    
Line of credit, debt issuance costs incurred $ 800,000    
Amortization of debt issuance costs   200,000 $ 100,000
Debt issuance costs, net   500,000 700,000
Covenant, maximum net leverage ratio 750.00%    
Aggregate principal amount outstanding   0  
Available borrowing capacity   44,700,000 59,500,000
Revolving Facility | Line of Credit | Revolving Credit Facility | Alternative Base Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable interest rate 1.25%    
Revolving Facility | Line of Credit | Revolving Credit Facility | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable interest rate 2.25%    
Revolving Facility | Line of Credit | Letter of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   25,000,000.0  
Letters of credit issued   $ 15,300,000 $ 500,000