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Long-term Debt and Financing Arrangements - Narrative (Details)
9 Months Ended 12 Months Ended
May 11, 2020
USD ($)
Aug. 31, 2018
USD ($)
lender
Sep. 30, 2020
USD ($)
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2022
May 10, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Weighted-average interest rate (as a percent)     5.20%           4.30%
Amended Credit Facility                  
Debt Instrument [Line Items]                  
Borrowings outstanding under term loan   $ 250,000,000              
Term Loan Due August 31, 2023                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 144,000,000             $ 200,000,000  
Borrowings outstanding under term loan   200,000,000 $ 138,500,000            
Amount of quarterly repayments of term commitment   2,500,000              
Debt issuance costs     500,000            
Amended Credit Facility - 2020                  
Debt Instrument [Line Items]                  
Outstanding standby letters of credit     $ 1,800,000            
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 314,000,000 $ 175,000,000              
Number of additional lenders | lender   3              
Revolving Credit Facility | Amended Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 314,000,000 $ 450,000,000              
Credit facility fixed charge coverage ratio (not less than)     1.25            
Required consolidated leverage ratio as of end of each fiscal quarter (no greater than)     3.5            
Revolving Credit Facility | Amended Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Quarterly unused line commitment fee (as a percent)     0.15%            
Revolving Credit Facility | Amended Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Quarterly unused line commitment fee (as a percent)     0.275%            
Revolving Credit Facility | Amended Credit Facility | Federal Funds Effective Swap Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     0.50%            
Revolving Credit Facility | Amended Credit Facility | Eurocurrency Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     1.00%            
Revolving Credit Facility | Amended Credit Facility | Eurocurrency Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     0.75%            
Revolving Credit Facility | Amended Credit Facility | Eurocurrency Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     2.00%            
Revolving Credit Facility | Amended Credit Facility | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     0.00%            
Revolving Credit Facility | Amended Credit Facility | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)     1.25%            
Revolving Credit Facility | Amended Credit Facility - 2020                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 170,000,000 $ 450,000,000           $ 250,000,000  
Credit facility fixed charge coverage ratio (not less than)           1.10      
Minimum cash and cash equivalents balances $ 40,000,000                
Outstanding borrowings     $ 283,500,000            
Remaining borrowing capacity     23,700,000           $ 121,600,000
Revolving Credit Facility | Amended Credit Facility - 2020 | Forecast                  
Debt Instrument [Line Items]                  
Credit facility fixed charge coverage ratio (not less than)       1.25 1.25        
Required consolidated leverage ratio as of end of each fiscal quarter (no greater than)       4.50 6.5   3.50    
Revolving Credit Facility | Amended Credit Facility - 2020 | Minimum                  
Debt Instrument [Line Items]                  
Quarterly unused line commitment fee (as a percent) 0.375%                
Revolving Credit Facility | Amended Credit Facility - 2020 | Eurocurrency Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 3.00%                
Revolving Credit Facility | Amended Credit Facility - 2020 | Eurocurrency Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 4.25%                
Revolving Credit Facility | Amended Credit Facility - 2020 | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 2.00%                
Revolving Credit Facility | Amended Credit Facility - 2020 | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 3.25%                
Revolving Credit Facility | Amended Credit Facility - 2020 | Base and Eurocurrency Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 1.00%                
Foreign Credit Facility                  
Debt Instrument [Line Items]                  
Outstanding borrowings     200,000            
Outstanding standby letters of credit     1,300,000            
Remaining borrowing capacity     $ 9,400,000