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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Debt Instrument [Line Items]      
Debt Outstanding Excluding Capital Lease Obligations $ 0 $ 0  
Interest paid $ 4,439,000 3,761,000 $ 3,891,000
Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit facility, initiation date Jun. 02, 2016    
Credit facility, expiration date Jun. 02, 2021    
Credit facility, borrowing capacity $ 250,000,000    
Credit facility, maximum borrowing capacity $ 400,000,000    
Security interest on voting capital stock 65.00%    
Security interest on non voting capital stock 100.00%    
Borrowings outstanding $ 0 $ 0  
Credit facility, debt covenants compliance The Company is currently in compliance with all of the debt covenants under the Credit Agreement.    
Revolving Credit Facility | Federal Reserve Bank of New York      
Debt Instrument [Line Items]      
Borrowings, basis spread on variable rate 0.50%    
Revolving Credit Facility | London Interbank Offered Rate      
Debt Instrument [Line Items]      
Borrowings, basis spread on variable rate 1.25%    
Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Credit facility, unused credit commitment fee 0.15%    
Credit facility event of default, minimum percentage that a person or group should acquire outstanding capital stock 35.00%    
Revolving Credit Facility | Maximum      
Debt Instrument [Line Items]      
Credit facility, unused credit commitment fee 0.25%    
Maximum Leverage ratio beyond which amount of cash dividends and other distributions to stockholders is limited 250.00%    
Letter of Credit      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 50,000,000