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Nature of Operations and Summary of Significant Accounting Policies - Revenue from Contract with Customers (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Accounting Policies [Abstract]    
Accounts Receivable $ 94,145 $ 95,740
Contract Assets 9,095 13,162
Contract Liabilities $ 31,847 $ 37,216