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Employee Benefit Plans (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 01, 2018 | Mar. 26, 2017
Pension and postretirement benefit plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other comprehensive income (loss) before reclassifications | $ 96,374 | $ 0

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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