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Postretirement Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2019 | Jul. 13, 2019 | Dec. 29, 2018 | Oct. 06, 2018 | Jul. 14, 2018 | Dec. 30, 2017 | Oct. 07, 2017 | Apr. 20, 2019 | Apr. 21, 2018 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement loss |  |  | $ (1,148,000) | $ (930,000) | $ (1,035,000) | $ (1,619,000) | $ (3,030,000) |  | $ (4,668,000) |  | $ 0 | $ (7,781,000) | $ (4,649,000) |
Voluntarily contributions made by an employer |  | $ 0 |  |  |  |  |  | $ 0 |  |  | 0 |  |  |
Expected pension cost for fiscal 2019 |  |  |  |  |  |  |  |  |  |  | 2,000,000.0 |  |  |
Expected company contribution |  |  |  |  |  |  |  |  |  |  | $ 675,000 |  |  |
Postretirement Benefits, minimum years of service for eligibility |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Postretirement Benefits, minimum age for eligibility |  |  |  |  |  |  |  |  |  |  | 55 years |  |  |
Expense under plans |  |  |  |  |  |  |  |  |  |  | $ 3,234,000 | $ 8,474,000 | $ (897,000) |
Contribution of pension fund in excess of total contribution |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% |
Multiemployer plans, minimum contribution |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Multiemployer plan, withdrawal obligation |  |  |  |  |  |  | $ 15,200,000 |  |  |  |  |  |  |
Multiemployer plans transition payments payable |  |  | 3,100,000 |  |  |  |  |  |  |  |  | $ 3,100,000 |  |
Multiemployer plans payable date |  |  |  |  |  |  |  |  |  |  |  | Nov. 03, 2017 |  |
Multiemployer plan withdrawal liability of net present value monthly payments period |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |
Multiemployer plans, increase in withdrawal obligation |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |
Multiemployer plan, withdrawal obligation paid |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan equity securities included in common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,030,363
Equity securities, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,200,000
Percentage of total plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.50%
Proceeds from sale of equity securities |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000.0 |  |
Pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  | (32,238,000) |  |  |  |  |  |  |  | (36,231,000) | (32,238,000) |  |
Settlement loss |  |  |  |  |  |  |  |  |  |  |  | (7,781,000) | $ (4,649,000) |
Actual return on plan assets |  |  |  |  |  |  |  |  |  |  | 51,848,000 | $ 2,437,000 | $ 42,100,000 |
Amortization from AOCI into net periodic cost (benefit) |  |  |  |  |  |  |  |  |  |  | $ 7,800,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  |  |  |  | 5.34% | 5.34% | 8.00% |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | $ 2,771,000 | $ 40,971,000 | $ 1,891,000 |
Last Fifteen Years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  |  |  |  |  |  |  | 7.10% |  |  |
Non Qualified Pension Plans | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  | (8,194,000) |  |  |  |  |  |  |  | $ (7,477,000) | (8,194,000) |  |
Amortization from AOCI into net periodic cost (benefit) |  |  |  |  |  |  |  |  |  |  | (300,000) |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | 722,000 | 1,308,000 |  |
Expected company contribution |  |  | $ 700,000 |  |  |  |  |  |  |  |  | 700,000 |  |
Contributions by participants |  |  |  |  |  |  |  |  |  |  | 662,000 | 823,000 | 300,000 |
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense under plans |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 | $ 1,000,000.0 | 2,100,000 |
Red Zone |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  |  |  |  | Less than 65 percent |  |  |
Yellow Zone |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  |  |  |  | Between 65 and less than 80 percent |  |  |
Green Zone |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  |  |  |  | At least 80 percent |  |  |
Plan No. 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  | 100,000 | $ 30,000,000.0 |  |  |  | $ 10,000,000.0 |  |  |  |  |
Percentage of total plan assets |  |  | 100.00% |  |  |  |  |  |  |  | 100.00% | 100.00% |  |
Plan No. 1 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  |  |  | 4.80% |  |  |  |
Expected company contribution |  |  |  |  |  |  |  |  |  | $ 30,000,000.0 |  |  |  |
Plan No. 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer | $ 2,500,000 |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Percentage of total plan assets |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Plan No. 2 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  |  |  | 7.10% |  |  |  |
Expected company contribution |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
Required | Pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | $ 1,040,000 | $ 271,000 | 286,000 |
Required | Non Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |
Discretionary | Pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | 1,731,000 | $ 40,700,000 | $ 1,605,000 |
Discretionary | Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  |  |  |  | 17,000,000.0 |  |  |
Defined benefit plans estimated final non-cash settlement charge |  |  |  |  |  |  |  |  |  |  | $ 125,000,000.0 |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  |  |  |  | $ 35,000,000.0 |  |  |
Defined benefit plans estimated final non-cash settlement charge |  |  |  |  |  |  |  |  |  |  | $ 143,000,000.0 |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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