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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 18, 2020 | Apr. 20, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Settlement and curtailment loss | $ 116,207 |
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 265 | $ 216
Interest cost | 1,423 | 3,671
Expected return on plan assets | (2,689) | (5,276)
Settlement and curtailment loss | 116,207 |
Amortization of prior service cost (credit) | 75 | 119
Amortization of net (gain) loss | 1,367 | 2,184
Total net periodic pension cost (income) | 116,648 | 914
Postretirement Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 87 | 87
Interest cost | 60 | 91
Amortization of prior service cost (credit) | (1) | (13)
Amortization of net (gain) loss | (92) | (85)
Total net periodic pension cost (income) | $ 54 | $ 80

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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