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. 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)
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	2,355,727
Ending Balance at Sep. 28, 2019	13,200,858	722,126	3,738,659	12,441,159	(500,296)	83,911	(3,284,701)
Beginning Balance at Mar. 30, 2019	12,450,398	721,671	3,719,040	11,635,790	(119,972)	4,052	(3,510,183)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	719,224			661,057		58,167
Dividends per share	(215,552)			(215,552)
Acquisition of shares from stockholders	(256,851)				(256,851)
Sale of shares to stockholders	40,282	0	6		40,276
Change for ESOP related shares	159,560						159,560
Ending Balance at Jun. 29, 2019	12,897,061	721,671	3,719,046	12,081,295	(336,547)	62,219	(3,350,623)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	595,718			574,026		21,692
Dividends per share	(214,162)			(214,162)
Acquisition of shares from stockholders	(223,598)				(223,598)
Sale of shares to stockholders	79,917	455	19,613		59,849
Change for ESOP related shares	65,922						65,922
Ending Balance at Sep. 28, 2019	13,200,858	722,126	3,738,659	12,441,159	(500,296)	83,911	(3,284,701)
Beginning Balance at Dec. 28, 2019	13,604,155	706,552	3,758,066	12,317,478	0	81,289	(3,259,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	528,841			667,335		(138,494)
Dividends per share	(211,847)			(211,847)
Contribution of shares to retirement plans	361,755	4,977	242,724		114,054
Acquisition of shares from stockholders	(442,509)				(442,509)
Sale of shares to stockholders	109,348	107	5,179		104,062
Change for ESOP related shares	(444,014)						(444,014)
Ending Balance at Mar. 28, 2020	13,505,729	711,636	4,005,969	12,772,966	(224,393)	(57,205)	(3,703,244)
Beginning Balance at Dec. 28, 2019	13,604,155	706,552	3,758,066	12,317,478	0	81,289	(3,259,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	3,074,769
Ending Balance at Sep. 26, 2020	15,227,652	711,636	4,005,969	14,607,846	(787,483)	204,084	(3,514,400)
Beginning Balance at Mar. 28, 2020	13,505,729	711,636	4,005,969	12,772,966	(224,393)	(57,205)	(3,703,244)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	1,625,752			1,367,055		258,697
Dividends per share	(225,495)			(225,495)
Acquisition of shares from stockholders	(332,605)				(332,605)
Sale of shares to stockholders	24,476	0	0		24,476
Change for ESOP related shares	136,540						136,540
Ending Balance at Jun. 27, 2020	14,734,397	711,636	4,005,969	13,914,526	(532,522)	201,492	(3,566,704)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Earnings	920,176			917,584		2,592
Dividends per share	(224,264)			(224,264)
Acquisition of shares from stockholders	(316,031)				(316,031)
Sale of shares to stockholders	61,070	0	0		61,070
Change for ESOP related shares	52,304						52,304
Ending Balance at Sep. 26, 2020	$ 15,227,652	$ 711,636	$ 4,005,969	$ 14,607,846	$ (787,483)	$ 204,084	$ (3,514,400)