Current Relevant Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-to-use	$ 194,149	$ 0
Operating lease liability	203,157
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-to-use	202,000
Operating lease liability	$ 211,000