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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Mar. 30, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Dec. 28, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate | 1.00% | (15.00%) |  | 13.00% | 6.00% |
Statutory federal income tax rate |  |  |  | 21.00% |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 60.9 |  |  | $ 60.9 |  | $ 60.5
Unrecognized tax benefit liabilities include interest and penalties | $ 11.1 |  |  | $ 11.1 |  | $ 11.0
Tax Year 2010 and 2011 [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Proposed Adjustments on Income Tax Assessments |  |  | $ 51.2 |  |  |

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