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Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 30, 2017 | Dec. 31, 2016
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Retirement Benefits [Abstract] |  |
Net loss, tax | $ 146.4 | $ 160.6
Prior service credit, tax | $ 0.9 | $ 1.3

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- Definition Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net gains (losses), tax + References No definition available. + Details
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- Definition Pension And Other Postretirement Benefit Plans Accumulated Other Comprehensive Income Loss Net Prior Service Cost Credit Tax + References No definition available. + Details
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