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Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 26, 2021 | Sep. 14, 2021 | Dec. 27, 2020
--- | --- | --- | ---
Carrying Value |  |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |  |
Cash surrender value of life insurance policies | $ 40,482 |  | $ 37,578
Interest rate swap liabilities | $ 8,162 |  | 13,452
Notes |  |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |  |
Fixed interest rate (as a percent) | 3.875% | 3.875% |
Notes | Carrying Value |  |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |  |
3.875% Fixed Rate Senior Notes | $ 400,000 |  |
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 | 40,482 |  | 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 | 8,162 |  | $ 13,452
Measured on Recurring Basis | Notes | Level 2 |  |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |  |
3.875% Fixed Rate Senior Notes | $ 401,000 |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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