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Debt (Term Facilities and Revolving Credit Facility) (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 18, 2020
Feb. 17, 2020
Nov. 06, 2017
Jul. 31, 2018
Dec. 31, 2017
Oct. 31, 2016
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Jul. 26, 2018
Jan. 15, 2014
Line of Credit Facility [Line Items]                        
Unamortized discount (premium) and debt issuance costs, net             $ 9,436,000 $ 12,138,000        
Line of credit facility, remaining borrowing capacity             45,000,000 45,000,000        
Repayments of debt     $ 104,936,000                  
Write off of deferred debt issuance cost       $ 2,581,000 $ 1,150,000 $ 1,844,000 1,795,000 0   $ 5,575,000    
Payments of Financing Costs             760,000          
Debt instrument, unused borrowing capacity, amount             32,037,000 32,044,000        
Long-term debt, gross             885,470,000 977,155,000        
Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Redemption Price, Percentage 1.00%                      
Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Line of credit facility, remaining borrowing capacity             125,000,000 125,000,000        
Letter of Credit [Member]                        
Line of Credit Facility [Line Items]                        
Letters of credit outstanding, amount             12,963,000 12,956,000        
Debt instrument, unused borrowing capacity, amount             $ 112,037,000 112,044,000        
Minimum [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, interest rate, stated percentage             3.00%          
First Lien Term Loan, due December 20, 2024                        
Line of Credit Facility [Line Items]                        
Unamortized discount (premium) and debt issuance costs, net             $ 9,436,000 $ 12,138,000        
First Lien Term Loan, due December 20, 2024 | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, periodic payment, principal             $ 2,369,000   $ 2,369,000      
Line of credit facility, remaining borrowing capacity                     $ 150,000,000  
Debt instrument, interest rate, stated percentage             2.91% 5.11%        
First Lien Term Loan, due December 20, 2024 | Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity                 150,000     $ 505,000
Second Lien Term Facility | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity                       75,000
Letter of Credit [Member] | Letter of Credit [Member]                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity                 45,000     35,000
Revolving Credit Facility | Letter of Credit [Member]                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity                 $ 125,000     $ 75,000
London Interbank Offered Rate (LIBOR) [Member] | First Lien Term Loan, due December 20, 2024 | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate             0.16% 2.11%        
Debt instrument, interest rate, stated percentage             2.75% 3.00%        
Line of Credit [Member] | Letter of Credit [Member]                        
Line of Credit Facility [Line Items]                        
Letters of credit outstanding, amount             $ 52,000 $ 204,000        
Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Long-term debt, gross             $ 0 $ 0        
Ratings Condition Period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate 2.50% 2.75%                    
Debt Instrument, Basis Spread on Interest Rate Floor 1.00%                      
Ratings Condition Period [Member] | Base Rate [Member] | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate 1.50% 1.75%                    
Debt Instrument, Basis Spread on Interest Rate Floor 2.00%                      
Other period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate 2.75% 3.00%                    
Other period [Member] | Base Rate [Member] | Term Loan [Member]                        
Line of Credit Facility [Line Items]                        
Debt instrument, basis spread on variable rate 1.75% 2.00%