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Summary of Reclassifications Out of AOCI (Detail) - USD ($) $ in Thousands | 4 Months Ended
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Apr. 24, 2021 | Apr. 18, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Gains and losses on cash flow hedges net of tax |  | $ (220) | $ (411)
Reclassification From AOCI, Current Period Net Of Tax | [1] | (356) | (88,284)
Derivative Instruments |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Gains and losses on cash flow hedges before tax | [1] | (294) | (547)
Reclassification from AOCI, Gains and losses on cash flow hedges tax (expense) benefit | [1] | 74 | 136
Reclassification from AOCI, Gains and losses on cash flow hedges net of tax | [1] | (220) | (411)
Reclassification From AOCI, Current Period Net Of Tax |  | (220) | (411)
Amortization of defined benefit pension items, prior service costs credits |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Current Period, before Tax | [1],[2] | (17) | (74)
Amortization of defined benefit pension items, settlement and curtailment loss |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Current Period, before Tax | [1] |  | (116,207)
Amortization of defined benefit pension items, actuarial losses |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Current Period, before Tax | [1],[2] | (164) | (1,275)
Accumulated Defined Benefit Plans Adjustment |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Current Period, before Tax | [1] | (181) | (117,556)
Reclassification from AOCI, Current Period, Tax benefit | [1] | 45 | 29,683
Reclassification From AOCI, Current Period Net Of Tax | [1] | (136) | (87,873)
Interest Rate Contracts | Derivative Instruments |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Gains and losses on cash flow hedges before tax | [1] | (219) | (44)
Commodity Contract | Derivative Instruments |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from AOCI, Gains and losses on cash flow hedges before tax | [1],[3] | (75) | (503)
Reclassification from AOCI, Gains and losses on cash flow hedges tax (expense) benefit |  | 19 | 126
Reclassification from AOCI, Gains and losses on cash flow hedges net of tax |  | $ (56) | $ (377)
[1] | Amounts in parentheses indicate debits to determine net income.
[2] | These items are included in the computation of net periodic pension cost and are reported in the other components of net periodic pension and postretirement benefits (credit) expense line item on the Condensed Consolidated Statements of Income. See Note 17, Postretirement Plans, of Notes to Condensed Consolidated Financial Statements of this Form 10-Q for additional information.
[3] | Amounts are presented as an adjustment to reconcile net income to net cash provided by operating activities on the Condensed Consolidated Statements of Cash Flows.

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580 + Details
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