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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2018 | Sep. 28, 2018 | Sep. 29, 2017 | Apr. 03, 2015 | Sep. 28, 2018 | Sep. 29, 2017 | Dec. 29, 2017 | Mar. 07, 2018 | Jan. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax rate |  | (15.00%) | 20.00% |  | 6.00% | 23.00% |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent |  | (22.00%) |  |  | (7.00%) |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Percent |  | (9.00%) |  |  | (3.00%) |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  | (8.00%) |  |  | (8.00%) |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Sourced Earnings, Provisional GILTI Tax, Percent |  | 4.00% |  |  | 3.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent |  |  |  |  | (2.00%) |  |  |  |
Statutory federal income tax rate |  |  |  |  | 21.00% |  | 35.00% |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 62.9 |  |  | $ 62.9 |  | $ 68.5 |  |
Unrecognized tax benefit liabilities include interest and penalties |  | 12.0 |  |  | 12.0 |  | $ 12.7 |  |
Tax Year 2010 and 2011 [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Proposed Adjustments on Income Tax Assessments |  |  |  | $ 67.0 |  |  |  |  |
Loss Contingency Accrual |  |  |  |  |  |  |  |  | $ 15.8
Loss Contingency Accrual, Payments | $ 8.6 |  |  |  |  |  |  |  |
Income Tax Examination, Penalties and Interest Accrued |  |  |  |  |  |  |  | $ 51.2 |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | $ 7.0 |  |  | $ 7.0 |  |  |  |

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