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Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 28, 2021 | Dec. 27, 2020
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Carrying Value |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Cash surrender value of life insurance policies | $ 38,721 | $ 37,578
Interest rate swap liabilities | 11,615 | 13,452
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 | 38,721 | 37,578
Measured on Recurring Basis | Level 2 |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Interest rate swap liabilities | $ 11,615 | $ 13,452

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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
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