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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 | Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Apr. 21, 2018 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement loss | $ 1,148 | $ 930 | $ 1,035 | $ 1,619 | $ 3,030 | $ 173 | $ 1,832 | $ 4,641 | $ 4,668 | $ 7,781 | $ 4,649 | $ 6,646
Pension plans |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | 937 | 755 | 830
Interest cost |  |  |  |  |  |  |  |  |  | 12,513 | 12,852 | 13,682
Expected return on plan assets |  |  |  |  |  |  |  |  |  | (18,831) | (25,669) | (26,644)
Settlement loss |  |  |  |  |  |  |  |  |  | 7,781 | 4,649 | 6,646
Prior service cost (credit) |  |  |  |  |  |  |  |  |  | 387 | 387 | 387
Actuarial (gain) loss |  |  |  |  |  |  |  |  |  | 5,811 | 6,355 | 7,294
Net periodic pension cost (income) |  |  |  |  |  |  |  |  |  | 8,598 | (671) | 2,195
Current year actuarial (gain) loss |  |  |  |  |  |  |  |  |  | 25,492 | 4,119 | 8,879
Settlement loss |  |  |  |  |  |  |  |  |  | (7,781) | (4,649) | (6,646)
Amortization of prior service (cost) credit |  |  |  |  |  |  |  |  |  | (387) | (387) | (387)
Amortization of actuarial gain (loss) |  |  |  |  |  |  |  |  |  | (5,811) | (6,355) | (7,294)
Total recognized in other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | 11,513 | (7,272) | (5,448)
Total recognized in net periodic benefit cost and other comprehensive loss (income) |  |  |  |  |  |  |  |  |  | 20,111 | (7,943) | (3,253)
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | 288 | 256 | 401
Interest cost |  |  |  |  |  |  |  |  |  | 234 | 227 | 309
Prior service cost (credit) |  |  |  |  |  |  |  |  |  | (212) | (212) | (212)
Actuarial (gain) loss |  |  |  |  |  |  |  |  |  | (431) | (497) | (454)
Net periodic pension cost (income) |  |  |  |  |  |  |  |  |  | (121) | (226) | 44
Current year actuarial (gain) loss |  |  |  |  |  |  |  |  |  | 1,036 | 188 | (2,354)
Amortization of prior service (cost) credit |  |  |  |  |  |  |  |  |  | 212 | 212 | 212
Amortization of actuarial gain (loss) |  |  |  |  |  |  |  |  |  | 431 | 497 | 454
Total recognized in other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | 1,679 | 897 | (1,688)
Total recognized in net periodic benefit cost and other comprehensive loss (income) |  |  |  |  |  |  |  |  |  | $ 1,558 | $ 671 | $ (1,644)

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