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Summary of Reclassifications Out of AOCI (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Jan. 02, 2016 | Oct. 10, 2015 | Jul. 18, 2015 | Apr. 23, 2016 | Apr. 25, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | $ 249,537 | $ 293,031 | $ 268,054
Tax benefit |  |  |  |  |  |  |  |  |  | (85,761) | (103,840) | (92,315)
Net income |  | $ 13,042 | $ 40,216 | $ 51,155 | $ 32,246 | $ 43,796 | $ 51,760 | $ 59,363 | $ 61,389 | 163,776 | 189,191 | 175,739
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax | [1] |  |  |  |  |  |  |  |  | (11,800) | (7,952) | (13,369)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 3,399 | 5,413 | 3,366
Gains/Losses on Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax |  |  |  |  |  |  |  |  |  | (3,399) | (5,413) |
Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | [1] |  |  |  |  |  |  |  |  | (5,528) | (8,801) | (5,473)
Tax benefit | [1] |  |  |  |  |  |  |  |  | 2,129 | 3,388 | 2,107
Net income | [1] |  |  |  |  |  |  |  |  | (3,399) | (5,413) | (3,366)
Pension and postretirement benefit items, prior service credits |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1],[2] |  |  |  |  |  |  |  |  | (175) | 267 | 469
Pension and postretirement benefit items, Settlement losses |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1],[2] |  |  |  |  |  |  |  |  | (6,646) |  | (15,387)
Pension and postretirement benefit items, actuarial losses |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1],[2] |  |  |  |  |  |  |  |  | (6,840) | (4,395) | (1,348)
Accumulated Defined Benefit Plans Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit | [1] |  |  |  |  |  |  |  |  | 5,260 | 1,589 | 6,263
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] |  |  |  |  |  |  |  |  | (13,661) | (4,128) | (16,266)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax | [1] |  |  |  |  |  |  |  |  | (8,401) | (2,539) | (10,003)
Interest Rate Contracts | Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | [1] |  |  |  |  |  |  |  |  | (221) | (250) | (255)
Commodity Contract | Gains/Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales | [1],[3] |  |  |  |  |  |  |  |  | $ (5,307) | $ (8,551) | $ (5,218)
[1] | Amounts in parentheses indicate debits to determine net income.
[2] | These items are included in the computation of net periodic pension cost. See Note 19, Postretirement Plans, for additional information.
[3] | Amounts are presented as an adjustment to reconcile net income to net cash provided by operating activities on the Consolidated Statements of Cash Flows.

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