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Postretirement Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 4 Months Ended
--- | --- | ---
Oct. 05, 2019 | Oct. 07, 2017 | Apr. 20, 2019 | Apr. 21, 2018
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |
Defined benefit plans estimated final non-cash settlement charge |  |  | $ 125,000,000.0 |
Settlement loss |  |  | 0 | $ (4,668,000)
Voluntarily contributions made by an employer |  |  | 0 | 10,000,000.0
Multiemployer plan, withdrawal obligation |  | $ 15,200,000 |  |
Multiemployer plans, increase in withdrawal obligation |  |  |  | 2,300,000
Multiemployer plans transition payments payable |  |  | $ 3,100,000 |
Multiemployer plans payable date |  |  | Nov. 03, 2017 |
Multiemployer plan withdrawal liability of net present value monthly payments period |  | 20 years |  |
Multiemployer plan, withdrawal obligation paid |  |  |  | 200,000
401(k) Retirement Savings Plans |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |
Total cost and employer contributions |  |  | $ 8,500,000 | $ 7,300,000
Scenario, Forecast |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |
Voluntarily contributions made by an employer | $ 2,500,000 |  |  |
Minimum |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  | 5,000,000.0 |
Maximum |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  | $ 35,000,000.0 |

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- Definition Multiemployer plan withdrawal liability of net present value monthly payments period. + References No definition available. + Details
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- Definition Multiemployer plans tax payments payable date. + References No definition available. + Details
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- Definition Multiemployer plans transition payments payable. + References No definition available. + Details
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- Definition Multiemployer plans, withdrawal obligation increase (decrease). + References No definition available. + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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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