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Long-Term Debt (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2019
USD ($)
Oct. 21, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument          
Long-term and short-term debt, combined amount $ 780,000   $ 780,000    
Current portion of long-term debt (35,000)   (35,000)   $ 0
Unamortized debt issuance expense (8,000)   (8,000)    
Unamortized debt discount (13,200) $ (14,000) (13,200)    
Long-term Debt $ 723,800   723,800    
Payments of debt issuance costs and deferred financing fees   9,600 $ 9,600 $ 0  
Proceeds from debt, net of discount and issuance costs   776,400      
Debt covenant, leverage ratio 6.00   6.00    
Bridge Loan [Member]          
Debt Instrument          
Proceeds from issuance of long-term debt     $ 1,225,000    
Interest costs incurred     2,200    
Gross Repayments of Long-term debt     1,225,000    
Term Loan [Member]          
Debt Instrument          
Long-term Debt, Gross $ 700,000   $ 700,000    
Discount percentage on debt instrument     98.00%    
Periodic payment of long-term debt principal 8,750        
Term Loan [Member] | Federal Funds [Member]          
Debt Instrument          
Basis spread on variable interest rate     0.50%    
Term Loan [Member] | One-Month Eurodollar [Member]          
Debt Instrument          
Basis spread on variable interest rate     1.00%    
Term Loan [Member] | Base Rate [Member]          
Debt Instrument          
Basis spread on variable interest rate     4.00%    
Term Loan [Member] | Eurodollar [Member]          
Debt Instrument          
Basis spread on variable interest rate     5.00%    
Letter of Credit [Member]          
Debt Instrument          
Maximum borrowing capacity on line of credit 20,000   $ 20,000    
Revolving Credit Facility [Member]          
Debt Instrument          
Long-term Debt, Gross 80,000   80,000    
Maximum borrowing capacity on line of credit 200,000   200,000    
Proceeds from borrowing under line of credit   100,000 120,000    
Repayments of Lines of Credit   $ 20,000 40,000    
Remaining borrowing capacity on line of credit 120,000   120,000    
Letters of credit outstanding, amount 0   0    
Debt covenant, maximum undischarged judgments $ 65,000   $ 65,000    
Unused capacity on line of credit commitment fee percentage     0.50%    
Revolving Credit Facility [Member] | Minimum [Member]          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage     0.25%    
Revolving Credit Facility [Member] | Maximum [Member]          
Debt Instrument          
Unused capacity on line of credit commitment fee percentage     0.50%    
Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument          
Basis spread on variable interest rate     3.25%    
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument          
Basis spread on variable interest rate     2.75%    
Revolving Credit Facility [Member] | Base Rate [Member] | Median [Member]          
Debt Instrument          
Basis spread on variable interest rate     3.00%    
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument          
Basis spread on variable interest rate     3.25%    
Revolving Credit Facility [Member] | Eurodollar [Member]          
Debt Instrument          
Basis spread on variable interest rate     4.25%    
Revolving Credit Facility [Member] | Eurodollar [Member] | Minimum [Member]          
Debt Instrument          
Basis spread on variable interest rate     3.75%    
Revolving Credit Facility [Member] | Eurodollar [Member] | Median [Member]          
Debt Instrument          
Basis spread on variable interest rate     4.00%    
Revolving Credit Facility [Member] | Eurodollar [Member] | Maximum [Member]          
Debt Instrument          
Basis spread on variable interest rate     4.25%    
Revolving Credit Facility [Member] | Excess Cash Flow Ratio [Member]          
Debt Instrument          
Debt covenant, leverage ratio 3.35   3.35    
Revolving Credit Facility [Member] | High-End Ratio [Member]          
Debt Instrument          
Debt covenant, leverage ratio 3.50   3.50    
Revolving Credit Facility [Member] | Low-End Ratio [Member]          
Debt Instrument          
Debt covenant, leverage ratio 2.50   2.50