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Debt and Credit Arrangements - Interest Rate Swaps (Details) - Interest rate swap - USD ($)
$ in Thousands
Dec. 29, 2019
Dec. 30, 2018
Other current and long-term assets    
Debt and Credit Arrangements    
Derivatives designated as hedging instruments, fair value   $ 4,905
Other current and long-term Liabilities    
Debt and Credit Arrangements    
Derivatives designated as hedging instruments, fair value $ 6,168