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. 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. 26, 2020	15,757,218	690,982	4,005,969	14,343,865	0	200,951	(3,484,549)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive earnings	1,387,341			1,495,093		(107,752)
Dividends per share	(220,975)			(220,975)
Contribution of shares to retirement plans	408,569	4,743	285,438		118,388
Acquisition of shares from stockholders	(340,092)				(340,092)
Sale of shares to stockholders	90,882	0	5		90,877
Change for ESOP related shares	(560,684)						(560,684)
Ending Balance at Mar. 27, 2021	$ 16,522,259	$ 695,725	$ 4,291,412	$ 15,617,983	$ (130,827)	$ 93,199	$ (4,045,233)