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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 23, 2022 | Apr. 24, 2021
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 366 | $ 299
Interest cost | 272 | 233
Expected return on plan assets | (577) | (575)
Amortization of prior service cost (credit) | 17 | 18
Amortization of net (gain) loss | 142 | 229
Total net periodic pension cost (income) | 220 | 204
Postretirement Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 66 | 103
Interest cost | 34 | 36
Amortization of prior service cost (credit) | (72) | (1)
Amortization of net (gain) loss | (54) | (65)
Total net periodic pension cost (income) | $ (26) | $ 73

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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=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: 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=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: 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=123447040&loc=d3e2709-114920 + Details
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