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Recent Accounting Pronouncements - Summary of Reclassification of Tax Effects to Retained Earnings from AOCI (Detail) - USD ($) $ in Thousands |  | 4 Months Ended
--- | --- | ---
Dec. 31, 2017 | Apr. 21, 2018 | Apr. 22, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Pension and postretirement plans |  | $ 4,309 | $ (1,612)
Retained Earnings |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Pension and postretirement plans | $ (17,097) |  |
Hedged financial instruments | (1,709) |  |
Total reclassification of stranded income tax effects to retained earnings from AOCI | (18,806) |  |
AOCI |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Pension and postretirement plans | 17,097 |  |
Hedged financial instruments | 1,709 |  |
Total reclassification of stranded income tax effects to retained earnings from AOCI | $ 18,806 |  |

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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