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Income Taxes (Deferred Tax Assets and Liabilities Current Noncurrent) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2018 | Dec. 28, 2018 | Dec. 29, 2017
Income Tax Disclosure [Abstract] |  |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Undistributed Accumulated Earnings Of Foreign Subsidiary |  |  | $ 147,500,000
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Noncurrent deferred tax asset |  | $ 3,937,000 | 3,451,000
Noncurrent deferred tax liability |  | (203,910,000.000) | (140,964,000.000)
Net deferred tax liability |  | (199,973,000) | (141,212,000)
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) |  | 14,700,000 | $ 14,700,000
Tax benefit from revaluation of net deferred tax liabilities |  | 56,500,000 |
Tax Cuts And Jobs Act Of 2017, Measurement Period Adjustment, Transition Tax |  | 18,900,000 |
Tax Cuts And Jobs Act Of 2017, Measurement Period Adjustment, Transition Tax Adjustment | $ 4,200,000 |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Measurement Period Adjustments, Provisional Income Tax (Expense) Benefit |  | $ 60,700,000 |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit, Adjustment | $ 4,200,000 |  |

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