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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 29, 2020
Dec. 29, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Jul. 23, 2018
Schedule of Stockholders' Equity [Line Items]                          
Repurchased Common Shares For Activity Pursuant to Equity Incentive Plans                   68,536 66,506 78,644  
Aggregate Cost of Repurchased Common Shares for Activity Pursuant to Equity Incentive Plans                   $ 6,300 $ 5,200 $ 4,400  
Cash dividends (per share)   $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.28 $ 0.28    
Cost of Repurchased Common Shares, Repurchase Plan and Amount for Statutory Tax Withholding Obligations                   $ 6,313 $ 57,393 4,367  
Dividends accrued   $ 7,800               7,800      
Unrecognized prior service credit (cost), net of tax                   807 (77) (77)  
Unrecognized prior service credit (cost), net of tax1                   800 $ (100) $ (100)  
Dividends Payable, Date Declared   Oct. 24, 2019                      
Repurchase Program, 07/23/2018 [Member]                          
Schedule of Stockholders' Equity [Line Items]                          
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 197,800               $ 197,800      
Stock Repurchase Program, Authorized Amount                         $ 250,000
Subsequent Event [Member]                          
Schedule of Stockholders' Equity [Line Items]                          
Cash dividends (per share) $ 0.07                        
Dividends Payable, Date Declared Jan. 23, 2020