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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) | 4 Months Ended
--- | ---
Apr. 20, 2019 | Apr. 21, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Settlement loss | $ 0 | $ 4,668,000
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 216,000 | 288,000
Interest cost | 3,671,000 | 3,124,000
Expected return on plan assets | (5,276,000) | (5,407,000)
Settlement loss |  | 4,668,000
Amortization of prior service cost (credit) | 119,000 | 100,000
Amortization of net (gain) loss | 2,184,000 | 1,573,000
Total net periodic pension cost (income) | 914,000 | 4,346,000
Postretirement Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 87,000 | 89,000
Interest cost | 91,000 | 72,000
Amortization of prior service cost (credit) | (13,000) | (65,000)
Amortization of net (gain) loss | (85,000) | (133,000)
Total net periodic pension cost (income) | $ 80,000 | $ (37,000)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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=112275985&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)(5) -URI http://asc.fasb.org/extlink&oid=108410482&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)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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