Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Parenth) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Accounting Policies [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	$ (36,719)	$ 43,592
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(170,938)	(203,063)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	2,543	4,243
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 7,233	$ 6,365