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Debt - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 15, 2018
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Jul. 02, 2021
Jul. 01, 2021
Long-term Debt, Unclassified [Abstract]              
Repayments of long-term debt     $ 7,988,000 $ 23,313,000 $ 105,326,000    
Credit Agreement | Revolving Credit Facility | Term loan              
Long-term Debt, Unclassified [Abstract]              
Face amount of debt $ 1,065,000,000            
Credit Agreement | Revolving Credit Facility | Term loan | Level 2              
Long-term Debt, Unclassified [Abstract]              
Debt, fair value   $ 928,375,000 928,375,000        
Credit Agreement | Revolving Credit Facility | Term loan | LIBOR floor              
Long-term Debt, Unclassified [Abstract]              
Basis spread on variable rate 0.00%            
Credit Agreement | Revolving Credit Facility | Term loan | Base rate              
Long-term Debt, Unclassified [Abstract]              
Basis spread on variable rate 1.00%            
Amended Credit Agreement | Revolving Credit Facility              
Long-term Debt, Unclassified [Abstract]              
Repayments of long-term debt     0 10,000,000      
Amended Credit Agreement | Revolving Credit Facility | Term loan              
Long-term Debt, Unclassified [Abstract]              
Amortization equal quarterly installments of initial principal 0.25%            
Amended Credit Agreement | Revolving Credit Facility | Line of credit              
Long-term Debt, Unclassified [Abstract]              
Debt requirements, annual excess cash flow 50.00%            
Debt requirements, net cash proceeds of recovery events and non-ordinary course asset sales 100.00%            
Line of credit facility, borrowing capacity           $ 350,000,000 $ 200,000,000
Long-term line of credit   $ 0 $ 0 $ 0      
Amended Credit Agreement | Revolving Credit Facility | Line of credit | LIBOR              
Long-term Debt, Unclassified [Abstract]              
Basis spread on variable rate     1.50% 1.50%      
Amended Credit Agreement | Revolving Credit Facility | Line of credit | Base rate              
Long-term Debt, Unclassified [Abstract]              
Basis spread on variable rate   0.50%          
Amended Credit Agreement | Letter of credit | Line of credit              
Long-term Debt, Unclassified [Abstract]              
Line of credit facility, borrowing capacity   $ 50,000,000 $ 50,000,000