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DEBT - Long-term Debt Obligations (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Aug. 10, 2020
Dec. 28, 2019
Nov. 01, 2018
Oct. 31, 2018
Jun. 14, 2018
Debt            
Total $ 311,853   $ 163,850      
Less current portion (100)   (2,816)      
Less debt issuance costs (146)   (167)      
Long-term portion 311,607   160,867      
Finance Leases and Foreign Affiliate Debt            
Debt            
Total 138   174      
Senior Notes | Series 2020 E Senior Notes            
Debt            
Total $ 50,000          
Interest rate (in hundredths) 3.04% 3.04%        
Senior Notes | Series 2020 F Senior Notes            
Debt            
Total $ 50,000          
Interest rate (in hundredths) 3.08% 3.08%        
Senior Notes | Series 2020 G Senior Notes            
Debt            
Total $ 50,000          
Interest rate (in hundredths) 3.15% 3.15%        
Senior Notes | Series 2018 C Senior Notes            
Debt            
Total $ 40,000   $ 40,000      
Interest rate (in hundredths) 4.20%   4.20%     4.20%
Senior Notes | Series 2018 D Senior Notes            
Debt            
Total $ 35,000   $ 35,000      
Interest rate (in hundredths) 4.27%   4.27%     4.27%
Senior Notes | Series 2012 Senior Notes Tranche A            
Debt            
Total $ 35,000   $ 35,000      
Interest rate (in hundredths) 3.89%   3.89%      
Senior Notes | Series 2012 Senior Notes Tranche B            
Debt            
Total $ 40,000   $ 40,000      
Interest rate (in hundredths) 3.98%   3.98%      
Revolving Credit Facility            
Debt            
Maximum borrowing capacity $ 375,000     $ 375,000 $ 295,000  
Interest rate at period end (in hundredths)     2.54%      
Revolving Credit Facility | Domestic and Foreign Borrowings            
Debt            
Total 4,700   $ 4,000      
Revolving Credit Facility | Foreign Affiliate Debt            
Debt            
Total $ 4,715   $ 3,976      
Interest rate at period end (in hundredths) 1.125%   1.88%      
Corporate Debt Securities | Series 1999 Industrial Development Revenue Bonds            
Debt            
Total $ 3,300   $ 3,300      
Interest rate at period end (in hundredths) 0.20%   1.14%      
Corporate Debt Securities | Series 2000 Industrial Development Revenue Bonds            
Debt            
Total     $ 2,700      
Interest rate at period end (in hundredths)     1.57%      
Corporate Debt Securities | Series 2002 Industrial Development Revenue Bonds            
Debt            
Total $ 3,700   $ 3,700      
Interest rate at period end (in hundredths) 0.22%   1.79%