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Long-term Debt - Term Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 23, 2018
Mar. 31, 2020
Mar. 31, 2019
Feb. 06, 2020
Debt Instrument [Line Items]        
Aggregate principal amount outstanding   $ 521,125    
Secured Debt | First Lien Term Loan        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 950,000      
Debt issuance costs and original issuance discount, gross       $ 900
Aggregate principal amount outstanding   $ 521,100 $ 947,600  
Interest rate   3.20% 5.70%  
Secured Debt | First Lien Term Loan | Alternative Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 1.25%      
Secured Debt | First Lien Term Loan | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 2.25%      
Secured Debt | First And Second Lien Term Loans        
Debt Instrument [Line Items]        
Debt issuance costs and original issuance discount, gross   $ 16,400    
Threshold of sale of property or assets that requires loan prepayments $ 5,000      
Threshold of proceeds received from insurance settlement or new debt agreements that require loan prepayments 5,000      
Debt issuance costs and original issuance discount   10,600 $ 14,300  
Amortization of debt issuance costs and original issuance discount   $ 1,700 1,200  
Secured Debt | Second Lien Term Loan        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 170,000      
Aggregate principal amount outstanding     $ 88,700  
Interest rate     9.50%  
Secured Debt | Second Lien Term Loan | Alternative Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 6.00%      
Secured Debt | Second Lien Term Loan | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 7.00%      
Letter Of Credit Sublimit | Secured Debt | Revolving Facility        
Debt Instrument [Line Items]        
Increase in borrowing capacity       $ 10,000