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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 11, 2020 | Jul. 13, 2019 | Jul. 11, 2020 | Jul. 13, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlement and curtailment loss |  |  | $ 116,207 |
Pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 197 | $ 163 | 462 | $ 378
Interest cost | 228 | 2,752 | 1,651 | 6,425
Expected return on plan assets | (415) | (3,957) | (3,104) | (9,233)
Settlement and curtailment loss |  |  | 116,207 |
Amortization of prior service cost (credit) | 13 | 89 | 88 | 208
Amortization of net (gain) loss | 126 | 1,638 | 1,493 | 3,822
Total net periodic pension cost (income) | 149 | 685 | 116,797 | 1,600
Postretirement Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 65 | 65 | 152 | 153
Interest cost | 46 | 69 | 106 | 160
Amortization of prior service cost (credit) | (1) | (9) | (2) | (22)
Amortization of net (gain) loss | (69) | (63) | (161) | (149)
Total net periodic pension cost (income) | $ 41 | $ 62 | $ 95 | $ 142

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