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Benefit Plans - Funded Status of Plans (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 148,992 | $ 81,362
Fair value of plan assets | 100,439 | 42,058
Accumulated benefit obligation | 130,453 | 75,744
Fair value of plan assets | $ 92,248 | $ 42,058

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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