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Long-Term Debt Narrative (Details) - USD ($)
May 31, 2018
Sep. 26, 2020
Dec. 28, 2019
Debt Instrument [Line Items]      
Long-term debt obligations   $ 174,502,000 $ 175,229,000
Deferred debt issuance costs, current   400,000  
Deferred debt issuance costs, noncurrent   700,000  
Revolving credit facility with interest at a variable rate (September 26, 2020 - 1.2%; December 28, 2019 - 2.8%)      
Debt Instrument [Line Items]      
Long-term line of credit outstanding   75,000,000  
Line of credit maximum borrowing capacity   450,000,000  
Line of credit remaining borrowing capacity   $ 375,000,000  
Ratio of interest coverage to earnings for the last four fiscal quarters   4.0  
Ratio of leverage to earnings for the last four fiscal quarters   3.5  
Notes Payable to Banks      
Debt Instrument [Line Items]      
Long-term debt obligations   $ 75,000,000  
Private Placement      
Debt Instrument [Line Items]      
Fair value of debt obligations   124,000,000  
Deferred debt issuance costs, noncurrent   $ 500,000  
Borrowings $ 100,000,000    
Fixed rate notes due in 2025 with an interest rate of 4.22%      
Debt Instrument [Line Items]      
Borrowings $ 50,000,000    
Note term 7 years    
Interest rate 4.22% 4.22%  
Fixed rate notes due in 2028 with an interest rate of 4.40%      
Debt Instrument [Line Items]      
Borrowings $ 50,000,000    
Note term 10 years    
Interest rate 4.40% 4.40%