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Long-Term Debt (Narrative) (Details) - USD ($)
May 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]      
Long-term debt   $ 175,229,000 $ 250,034,000
Debt issuance costs current   400,000  
Debt issuance cost noncurrent   1,000,000.0  
Revolving commitment      
Debt Instrument [Line Items]      
Outstanding revolving credit facility   75,000,000  
Maximum line of credit facility borrowing capacity   450,000,000  
Remaining borrowing capacity   375,000,000  
Revolving credit facility with interest at a variable rate (December 28, 2019 - 2.8%; December 29, 2018 - 3.5%)      
Debt Instrument [Line Items]      
Long-term debt   $ 75,000,000 $ 150,000,000
Fixed interest rate   2.80% 3.50%
Private Placement Notes      
Debt Instrument [Line Items]      
Fair value of debt   $ 116,000,000  
Debt issuance cost noncurrent   600,000  
Outstanding revolving credit facility   100,000,000  
Fixed rate notes due in 2025 with an interest rate of 4.22%      
Debt Instrument [Line Items]      
Long-term debt   $ 50,000,000 $ 50,000,000
Revolving credit facility $ 50,000,000    
Debt instrument term 7 years    
Fixed interest rate 4.22% 4.22%  
Fixed rate notes due in 2028 with an interest rate of 4.40%      
Debt Instrument [Line Items]      
Long-term debt   $ 50,000,000 $ 50,000,000
Revolving credit facility $ 50,000,000    
Debt instrument term 10 years    
Fixed interest rate 4.40% 4.40%  
Revolving commitment      
Debt Instrument [Line Items]      
Interest coverage ratio   4.0  
Consolidated leverage ratio   3.5