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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
May 31, 2018
Jan. 02, 2021
Dec. 28, 2019
Debt Instrument [Line Items]      
Long-term debt   $ 175,365,000 $ 175,229,000
Debt issuance costs current   400,000  
Debt issuance cost noncurrent   $ 600,000  
Term of employment agreement   2 years  
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 (January 2, 2021 - 1.2%; December 28, 2019 - 2.8%)      
Debt Instrument [Line Items]      
Long-term debt   $ 75,000,000 $ 75,000,000
Fixed interest rate   1.20% 2.80%
Private Placement Notes      
Debt Instrument [Line Items]      
Fair value of debt   $ 122,000,000  
Debt issuance cost noncurrent   500,000  
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% 0.0422%  
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% 0.044%  
Revolving commitment      
Debt Instrument [Line Items]      
Interest coverage ratio   4.0  
Consolidated leverage ratio   3.5