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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