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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 20, 2024 | Apr. 22, 2023
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 224 | $ 210
Interest cost | 362 | 401
Expected return on plan assets | (494) | (480)
Amortization of prior service cost (credit) | 18 | 18
Amortization of net (gain) loss | 13 | 53
Total net periodic pension cost (credit) | 123 | 202
Postretirement Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 56 | 55
Interest cost | 70 | 73
Amortization of prior service cost (credit) | (72) | (72)
Amortization of net (gain) loss | (55) | (76)
Total net periodic pension cost (credit) | $ (1) | $ (20)

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