Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Cash flows from operating activities:
Cash received from customers	$ 36,296,870	$ 34,729,287	$ 34,088,337
Cash paid to employees and suppliers	(32,177,582)	(30,821,593)	(30,291,186)
Income taxes paid	(563,983)	(478,457)	(683,464)
Self-insured claims paid	(395,457)	(344,905)	(338,010)
Dividends and interest received	192,528	241,773	246,202
Other operating cash receipts	297,098	273,435	268,347
Other operating cash payments	(17,548)	(19,259)	(37,271)
Net cash provided by operating activities	3,631,926	3,580,281	3,252,955
Cash flows from investing activities:
Payment for capital expenditures	(1,350,089)	(1,429,059)	(1,443,827)
Proceeds from sale of property, plant and equipment	43,834	6,300	6,268
Payment for investments	(2,778,691)	(3,069,417)	(2,526,973)
Proceeds from sale and maturity of investments	2,342,162	3,256,077	2,158,434
Net cash used in investing activities	(1,742,784)	(1,236,099)	(1,806,098)
Cash flows from financing activities:
Payment for acquisition of common stock	(1,405,872)	(1,751,864)	(960,262)
Proceeds from sale of common stock	307,933	283,222	330,040
Dividends paid	(734,510)	(689,660)	(667,902)
Repayment of long-term debt	(43,593)	(75,325)	(49,828)
Other, net	6,239	31,051	(12,762)
Net cash used in financing activities	(1,869,803)	(2,202,576)	(1,360,714)
Net increase in cash and cash equivalents	19,339	141,606	86,143
Cash and cash equivalents at beginning of year	579,925	438,319	352,176
Cash and cash equivalents at end of year	599,264	579,925	438,319
Reconciliation of net earnings to net cash provided by operating activities:
Net earnings	2,381,167	2,291,894	2,025,688
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	677,154	664,009	624,203
Increase (decrease) in last-in, first out (LIFO) reserve	24,170	23,028	(4,643)
Retirement contributions paid or payable in common stock	373,350	353,659	365,936
Deferred income taxes	63,245	(99,856)	24,357
(Gain) loss on disposal and impairment of property, plant and equipment	(13,185)	15,231	11,035
Loss (gain) on investments	73,254	(108,924)	(32,256)
Net amortization of investments	63,654	109,240	141,869
Change in operating assets and liabilities providing (requiring) cash:
Trade receivables	(10,790)	43,870	8,306
Inventories	3,614	(177,155)	22,764
Prepaid expenses and other noncurrent assets	199,930	82,089	(14,307)
Accounts payable and accrued expenses	112,383	151,186	(74,917)
Self-insurance reserves	11,962	19	5,340
Federal and state income taxes	(313,989)	241,686	159,426
Other noncurrent liabilities	(13,993)	(9,695)	(9,846)
Total adjustments	1,250,759	1,288,387	1,227,267
Net cash provided by operating activities	$ 3,631,926	$ 3,580,281	$ 3,252,955