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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 15, 2017 | Jul. 16, 2016 | Jul. 15, 2017 | Jul. 16, 2016
Pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 174 | $ 192 | $ 407 | $ 447
Interest cost | 3,006 | 2,884 | 7,013 | 7,417
Expected return on plan assets | (5,895) | (5,457) | (13,754) | (14,069)
Settlement loss |  | 4,641 |  | 4,641
Amortization of prior service cost (credit) | 89 | 76 | 208 | 195
Amortization of net (gain) loss | 1,469 | 1,155 | 3,427 | 2,953
Total net periodic benefit (income) cost | (1,157) | 3,491 | (2,699) | 1,584
Post-retirement Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 59 | 93 | 138 | 216
Interest cost | 52 | 71 | 122 | 166
Amortization of prior service cost (credit) | (49) | (49) | (114) | (114)
Amortization of net (gain) loss | (114) | (105) | (268) | (245)
Total net periodic benefit (income) cost | $ (52) | $ 10 | $ (122) | $ 23

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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