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Current Relevant Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-to-use $ 193,834 $ 0
Operating lease liability 202,837  
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