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Fair Value Measurements and Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Measurement of financial assets and liabilities at fair value on a recurring basis      
Impairment loss   $ 1,674 $ 1,350
Transfers among levels within the fair value hierarchy $ 0 0  
China Operations      
Measurement of financial assets and liabilities at fair value on a recurring basis      
Impairment loss   1,700 $ 1,400
Measured on Recurring Basis | Level 1      
Measurement of financial assets and liabilities at fair value on a recurring basis      
Cash surrender value of life insurance policies 27,751 28,645  
Measured on Recurring Basis | Level 2      
Measurement of financial assets and liabilities at fair value on a recurring basis      
Interest rate swap assets 4,905 651  
Measured on Recurring Basis | Carrying Value      
Measurement of financial assets and liabilities at fair value on a recurring basis      
Cash surrender value of life insurance policies 27,751 28,645  
Interest rate swap assets $ 4,905 $ 651