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Credit Arrangements and Debt Obligations - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 24, 2020
USD ($)
Apr. 23, 2020
USD ($)
Oct. 31, 2017
USD ($)
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2020
USD ($)
May 07, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                              
Borrowing outstanding under revolving credit facility             $ 0     $ 0         $ 0
Debt issuance costs                       $ 2,800,000      
Amortization of deferred financing costs             700,000   $ 400,000 1,700,000 $ 1,200,000        
Amortization of debt issuance cost             100,000   $ 100,000 300,000 $ 300,000        
Derivative, interest rate (percent)     3.65%                        
Net loss to be reclassified from accumulated other comprehensive loss and recorded to interest expense during the next twelve months             $ (5,800,000)     $ (5,800,000)          
Interest rate swaps                              
Debt Instrument [Line Items]                              
Derivative, notional amount     $ 500,000,000                        
Interest rate caps                              
Debt Instrument [Line Items]                              
Derivative, notional amount               $ 800,000,000              
Interest rate cap agreement, threshold for interest rate protection (percent)               1.00%              
Interest rate caps | June 30, 2020                              
Debt Instrument [Line Items]                              
Derivative, notional amount               $ 300,000,000              
Interest rate caps | October 29, 2021                              
Debt Instrument [Line Items]                              
Derivative, notional amount               $ 500,000,000              
Base Rate                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent)                   0.75%          
Eurocurrency                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent)                   1.75%          
Secured Debt | Senior Credit Facilities                              
Debt Instrument [Line Items]                              
Quarterly principal payments                   $ 2,700,000          
Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Weighted average interest rate (percent)             4.49%   3.86% 4.49% 3.86%        
Revolving Credit Facility | Senior Credit Facilities                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity $ 385,000,000 $ 225,000,000                   $ 400,000,000 $ 400,000,000 $ 225,000,000  
Gross leverage ratio             7.50 6.00              
Revolving Credit Facility | Senior Credit Facilities | Forecast                              
Debt Instrument [Line Items]                              
Gross leverage ratio         7.50 8.00                  
Net leverage ratio       4.25                      
Revolving Credit Facility | Senior Credit Facilities | Minimum                              
Debt Instrument [Line Items]                              
Commitment fee on unused capacity (percent) 0.30%                            
Revolving Credit Facility | Senior Credit Facilities | Maximum                              
Debt Instrument [Line Items]                              
Commitment fee on unused capacity (percent) 0.50%                            
Revolving Credit Facility | Senior Credit Facilities | Base Rate | Minimum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent) 0.50% 0.50%                          
Revolving Credit Facility | Senior Credit Facilities | Base Rate | Maximum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent) 1.25% 0.75%                          
Revolving Credit Facility | Senior Credit Facilities | Eurocurrency | Minimum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent) 1.50% 1.50%                          
Revolving Credit Facility | Senior Credit Facilities | Eurocurrency | Maximum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent) 2.25% 1.75%                          
Term Loan | Senior Credit Facilities                              
Debt Instrument [Line Items]                              
Effective interest rate for the term loans (percent)             2.50%     2.50%         3.55%
Weighted average interest rate (percent)             2.83%   4.16% 2.83% 4.16%        
Term Loan | Senior Credit Facilities | Base Rate | Minimum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent)                   1.75%          
Term Loan | Senior Credit Facilities | Eurocurrency | Minimum                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (percent)     0.75%             0.75%