CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Common Stock (Acquired from) Sold to Stockholders	Accumulated Other Comprehensive Earnings (Losses)	Common Stock Related To ESOP
Beginning Balance at Dec. 30, 2017	$ 11,017,149	$ 733,440	$ 3,139,647	$ 10,044,564	$ 0	$ 152,636	$ (3,053,138)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	656,877			680,271		(23,394)
Dividends per share	(168,597)			(168,597)
Contribution of shares to retirement plans	349,424	6,221	261,423		81,780
Acquisition of shares from stockholders	(432,894)				(432,894)
Sale of shares to stockholders	106,814	531	21,632		84,651
Change for ESOP related shares	(402,207)						(402,207)
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings	0			198,310		(198,310)
Ending Balance at Mar. 31, 2018	11,126,566	740,192	3,422,702	10,754,548	(266,463)	(69,068)	(3,455,345)
Beginning Balance at Dec. 29, 2018	11,823,342	715,445	3,458,004	10,840,654	0	(55,762)	(3,134,999)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	1,040,785			980,971		59,814
Dividends per share	(185,835)			(185,835)
Contribution of shares to retirement plans	367,951	5,605	235,017		127,329
Acquisition of shares from stockholders	(333,857)				(333,857)
Sale of shares to stockholders	113,196	621	26,019		86,556
Change for ESOP related shares	(375,184)						(375,184)
Ending Balance at Mar. 30, 2019	$ 12,450,398	$ 721,671	$ 3,719,040	$ 11,635,790	$ (119,972)	$ 4,052	$ (3,510,183)