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Summary of Recognized Settlement Loss by Quarter (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 06, 2018 | Jul. 14, 2018 | Oct. 07, 2017 | Apr. 21, 2018 | Oct. 06, 2018 | Oct. 07, 2017
Pension And Other Postretirement Benefit Expense [Abstract] |  |  |  |  |  |
Settlement loss | $ 930 | $ 1,035 | $ 3,030 | $ 4,668 | $ 6,633 | $ 3,030

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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