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Financial Instruments (Narrative) (Details) - Line of Credit [Member]
9 Months Ended
Oct. 27, 2020
USD ($)
Nov. 07, 2017
USD ($)
Sep. 30, 2020
USD ($)
coverageRatio
leverageRatio
Mar. 16, 2020
USD ($)
Nov. 28, 2017
USD ($)
Nov. 27, 2017
USD ($)
May 06, 2016
USD ($)
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 685,000,000          
Debt instrument term   5 years          
Long-term line of credit     $ 418,000,000        
Debt instrument, basis spread on variable rate     1.375%        
Maximum leverage ratio allowed | leverageRatio     3.50        
Minimum interest coverage ratio required | coverageRatio     3.00        
Leverage ratio | leverageRatio     1.50        
Interest coverage ratio | coverageRatio     14.62        
Line of credit facility, remaining borrowing capacity     $ 267,000,000        
Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Line of credit facility, current borrowing capacity           $ 300,000,000 $ 120,000,000
Amount received from terminate agreement           $ 6,300,000  
Amount paid to terminate agreement             $ 5,200,000
Notional amount       $ 350,000,000 $ 350,000,000    
Derivative, fixed interest rate       16.00% 2.11%    
LIBOR rate       3.485%      
Minimum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     1.25%        
Maximum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     1.75%        
Subsequent Event [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 700,000,000            
Debt instrument term 4 years            
Line of credit facility, increase (decrease) in interest rate $ 0.0025            
Subsequent Event [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 1.50%            
Subsequent Event [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 2.00%