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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 17, 2021 | Jul. 11, 2020 | Jul. 17, 2021 | Jul. 11, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlement and curtailment loss |  |  |  | $ 116,207
Pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 224 | $ 197 | $ 523 | 462
Interest cost | 175 | 228 | 408 | 1,651
Expected return on plan assets | (431) | (415) | (1,006) | (3,104)
Settlement and curtailment loss |  |  |  | 116,207
Amortization of prior service cost (credit) | 13 | 13 | 31 | 88
Amortization of net (gain) loss | 171 | 126 | 400 | 1,493
Total net periodic pension cost (income) | 152 | 149 | 356 | 116,797
Postretirement Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 78 | 65 | 181 | 152
Interest cost | 28 | 46 | 64 | 106
Amortization of prior service cost (credit) | (1) | (1) | (2) | (2)
Amortization of net (gain) loss | (48) | (69) | (113) | (161)
Total net periodic pension cost (income) | $ 57 | $ 41 | $ 130 | $ 95

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