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DEBT - Narrative (Details)
6 Months Ended
Mar. 13, 2020
USD ($)
Nov. 15, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Long-term Debt, Unclassified [Abstract]          
Current portion of long-term debt     $ 10,650,000   $ 13,313,000
Prepaid debt issuance cost     16,420,000   17,900,000
Proceeds from revolving line of credit     150,000,000 $ 0  
Revolving credit facility, outstanding     $ 150,000,000   $ 0
Percentage of debt hedged by interest rate swaps       70.00%  
Credit Agreement | Minimum          
Long-term Debt, Unclassified [Abstract]          
Secured net leverage ratio     1.00    
Credit Agreement | Maximum          
Long-term Debt, Unclassified [Abstract]          
Secured net leverage ratio     2.02    
Credit Agreement | Revolving credit facility | Term loan facility          
Long-term Debt, Unclassified [Abstract]          
Debt, term   7 years      
Percentage of initial principal payment amount   0.25%      
Current portion of long-term debt     $ 10,650,000    
Prepaid debt issuance cost     16,420,000    
Credit Agreement | Revolving credit facility | Term loan facility | Level 2          
Long-term Debt, Unclassified [Abstract]          
Fair value of debt     941,687,000    
Credit Agreement | Revolving credit facility | Term loan facility | LIBOR Floor          
Long-term Debt, Unclassified [Abstract]          
Basis spread on variable rate   0.00%      
Credit Agreement | Revolving credit facility | Term loan facility | LIBOR          
Long-term Debt, Unclassified [Abstract]          
Basis spread on variable rate   2.00%      
Credit Agreement | Revolving credit facility | Term loan facility | Base rate          
Long-term Debt, Unclassified [Abstract]          
Basis spread on variable rate   1.00%      
Credit Agreement | Revolving credit facility | Line of credit          
Long-term Debt, Unclassified [Abstract]          
Debt, term   5 years      
Debt requirements, annual excess cash flow   50.00%      
Debt requirements, net cash proceeds of recovery events and non-ordinary course asset sales   100.00%      
Proceeds from revolving line of credit $ 150,000,000.0        
Revolving credit facility, outstanding     150,000,000.0    
Available credit under the Revolving Credit Facility     $ 50,000,000.0    
Credit Agreement | Revolving credit facility | Line of credit | LIBOR          
Long-term Debt, Unclassified [Abstract]          
Basis spread on variable rate   1.50%      
Credit Agreement | Revolving credit facility | Line of credit | Base rate          
Long-term Debt, Unclassified [Abstract]          
Basis spread on variable rate   0.50%      
Commitment fee percentage   0.25%      
Credit Agreement | JPMorgan Chase Bank, N.A. | Revolving credit facility          
Long-term Debt, Unclassified [Abstract]          
Debt, term   7 years      
Line of credit facility, borrowing capacity   $ 1,265,000,000.0      
Credit Agreement | JPMorgan Chase Bank, N.A. | Revolving credit facility | Minimum          
Long-term Debt, Unclassified [Abstract]          
Secured net leverage ratio     1.00    
Credit Agreement | JPMorgan Chase Bank, N.A. | Revolving credit facility | Maximum          
Long-term Debt, Unclassified [Abstract]          
Secured net leverage ratio     4.00    
Credit Agreement | JPMorgan Chase Bank, N.A. | Revolving credit facility | Term loan facility          
Long-term Debt, Unclassified [Abstract]          
Debt, term   7 years      
Debt, face amount   $ 1,065,000,000.0      
Credit Agreement | JPMorgan Chase Bank, N.A. | Revolving credit facility | Line of credit          
Long-term Debt, Unclassified [Abstract]          
Line of credit facility, borrowing capacity   200,000,000.0      
Credit Agreement | JPMorgan Chase Bank, N.A. | Letter of credit sub-facility | Line of credit          
Long-term Debt, Unclassified [Abstract]          
Line of credit facility, borrowing capacity   $ 50,000,000.0