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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 29, 2018 | Oct. 06, 2018 | Jul. 14, 2018 | Dec. 30, 2017 | Oct. 07, 2017 | Apr. 21, 2018 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Settlement loss | $ 1,148 | $ 930 | $ 1,035 | $ 1,619 | $ 3,030 | $ 4,668 | $ 0 | $ 7,781 | $ 4,649
Pension plans |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  | 703 | 937 | 755
Interest cost |  |  |  |  |  |  | 11,930 | 12,513 | 12,852
Expected return on plan assets |  |  |  |  |  |  | (17,147) | (18,831) | (25,669)
Settlement loss |  |  |  |  |  |  |  | 7,781 | 4,649
Prior service cost (credit) |  |  |  |  |  |  | 387 | 387 | 387
Actuarial (gain) loss |  |  |  |  |  |  | 7,098 | 5,811 | 6,355
Net periodic pension cost (income) |  |  |  |  |  |  | 2,971 | 8,598 | (671)
Current year actuarial (gain) loss |  |  |  |  |  |  | 11,277 | 25,492 | 4,119
Settlement loss |  |  |  |  |  |  |  | (7,781) | (4,649)
Amortization of prior service (cost) credit |  |  |  |  |  |  | (387) | (387) | (387)
Amortization of actuarial gain (loss) |  |  |  |  |  |  | (7,098) | (5,811) | (6,355)
Total recognized in OCI |  |  |  |  |  |  | 3,792 | 11,513 | (7,272)
Total recognized in net periodic benefit cost (benefit) and OCI |  |  |  |  |  |  | 6,763 | 20,111 | (7,943)
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  | 283 | 288 | 256
Interest cost |  |  |  |  |  |  | 297 | 234 | 227
Prior service cost (credit) |  |  |  |  |  |  | (41) | (212) | (212)
Actuarial (gain) loss |  |  |  |  |  |  | (276) | (431) | (497)
Net periodic pension cost (income) |  |  |  |  |  |  | 263 | (121) | (226)
Current year actuarial (gain) loss |  |  |  |  |  |  | (575) | 1,036 | 188
Amortization of prior service (cost) credit |  |  |  |  |  |  | 41 | 212 | 212
Amortization of actuarial gain (loss) |  |  |  |  |  |  | 276 | 431 | 497
Total recognized in OCI |  |  |  |  |  |  | (258) | 1,679 | 897
Total recognized in net periodic benefit cost (benefit) and OCI |  |  |  |  |  |  | $ 5 | $ 1,558 | $ 671

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