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Summary of Effect of One Percent Point Change in Assumed Health Care Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |
One-Percentage Point Decrease, Effect on total of service and interest cost | $ (52) | $ (47) | $ (58)
One-Percentage Point Decrease, Effect on postretirement benefit obligation | (467) | (473) | (427)
One-Percentage Point Increase, Effect on total of service and interest cost | 61 | 55 | 67
One-Percentage Point Increase, Effect on postretirement benefit obligation | $ 524 | $ 533 | $ 480

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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