Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Cash flows from operating activities:
Cash received from customers	$ 38,269,943	$ 36,296,870	$ 34,729,287
Cash paid to employees and suppliers	(34,017,408)	(32,177,582)	(30,821,593)
Income taxes paid	(373,172)	(563,983)	(478,457)
Self-insured claims paid	(394,495)	(395,457)	(344,905)
Dividends and interest received	217,574	192,528	241,773
Other operating cash receipts	341,929	297,098	273,435
Other operating cash payments	(19,940)	(17,548)	(19,259)
Net cash provided by operating activities	4,024,431	3,631,926	3,580,281
Cash flows from investing activities:
Payment for capital expenditures	(1,141,118)	(1,350,089)	(1,429,059)
Proceeds from sale of property, plant and equipment	8,609	43,834	6,300
Payment for investments	(3,237,807)	(2,778,691)	(3,069,417)
Proceeds from sale and maturity of investments	2,113,287	2,342,162	3,256,077
Net cash used in investing activities	(2,257,029)	(1,742,784)	(1,236,099)
Cash flows from financing activities:
Payment for acquisition of common stock	(1,088,570)	(1,405,872)	(1,751,864)
Proceeds from sale of common stock	311,950	307,933	283,222
Dividends paid	(828,733)	(734,510)	(689,660)
Repayment of long-term debt	(11,061)	(43,593)	(75,325)
Other, net	13,130	6,239	31,051
Net cash used in financing activities	(1,603,284)	(1,869,803)	(2,202,576)
Net increase in cash and cash equivalents	164,118	19,339	141,606
Cash and cash equivalents at beginning of year	599,264	579,925	438,319
Cash and cash equivalents at end of year	763,382	599,264	579,925
Reconciliation of net earnings to net cash provided by operating activities:
Net earnings	3,005,395	2,381,167	2,291,894
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	716,669	677,154	664,009
Increase in last-in, first out (LIFO) reserve	39,939	24,170	23,028
Retirement contributions paid or payable in common stock	409,614	373,350	353,659
Deferred income taxes	215,004	63,245	(99,856)
Loss (gain) on disposal and impairment of property, plant and equipment	11,036	(13,185)	15,231
(Gain) loss on investments	(627,624)	73,254	(108,924)
Net amortization of investments	42,753	63,654	109,240
Change in operating assets and liabilities providing (requiring) cash:
Trade receivables	(54,890)	(10,790)	43,870
Inventories	(104,514)	3,614	(177,155)
Other assets	136,796	199,930	82,089
Accounts payable and accrued expenses	181,154	112,383	151,186
Federal and state income taxes	40,548	(313,989)	241,686
Other liabilities	12,551	(2,031)	(9,676)
Total adjustments	1,019,036	1,250,759	1,288,387
Net cash provided by operating activities	$ 4,024,431	$ 3,631,926	$ 3,580,281