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Postretirement Plans - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 29, 2018 | Mar. 31, 2018 | Oct. 07, 2017 | Apr. 21, 2018 | Apr. 22, 2017 | Dec. 30, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Pension plan settlement loss |  |  |  | $ 4,668,000 |  |
Expected long-term rate of return on plan assets |  | 6.40% |  |  |  |
Total cost and employer contributions |  |  |  | 7,300,000 | $ 9,000,000 |
Multiemployer plan, withdrawal obligation |  |  | $ 15,200,000 | 17,337,000 |  | $ 15,223,000
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 |  |
Qualified Pension Plan |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  | $ 10,000,000 |  |
Scenario, Forecast |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |
Expected long-term rate of return on plan assets | 5.90% |  |  |  |  |

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- Definition Multiemployer plans tax payments payable date. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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