CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Cash flows from operating activities:
Cash received from customers	$ 11,770,839	$ 11,208,724
Cash paid to employees and suppliers	(10,315,725)	(8,951,051)
Income taxes paid	(23,464)	(5,941)
Self-insured claims paid	(100,347)	(94,811)
Dividends and interest received	69,002	63,598
Other operating cash receipts	94,083	77,018
Other operating cash payments	(6,091)	(5,032)
Net cash provided by operating activities	1,488,297	2,292,505
Cash flows from investing activities:
Payment for capital expenditures	(345,933)	(269,288)
Proceeds from sale of property, plant and equipment	1,403	1,186
Payment for investments	(627,866)	(924,827)
Proceeds from sale and maturity of investments	265,360	299,116
Net cash used in investing activities	(707,036)	(893,813)
Cash flows from financing activities:
Payment for acquisition of common stock	(340,092)	(442,509)
Proceeds from sale of common stock	90,882	109,348
Dividends paid	(220,975)	(211,847)
Repayment of long-term debt	(3,986)	(2,816)
Other, net	(1,514)	4,625
Net cash used in financing activities	(475,685)	(543,199)
Net increase in cash and cash equivalents	305,576	855,493
Cash and cash equivalents at beginning of period	673,483	763,382
Cash and cash equivalents at end of period	979,059	1,618,875
Reconciliation of net earnings to net cash provided by operating activities:
Net earnings	1,495,093	667,335
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	192,241	178,969
Increase in last-in, first out (LIFO) reserve	11,291	9,525
Retirement contributions paid or payable in common stock	106,140	98,651
Deferred income taxes	163,276	(99,660)
Loss on disposal and impairment of long-lived assets	11,485	1,625
(Gain) loss on investments	(792,339)	385,113
Net amortization of investments	19,373	10,277
Changes in operating assets and liabilities providing (requiring) cash:
Trade receivables	86,223	(97,298)
Inventories	(29,842)	284,877
Other assets	5,169	(6,765)
Accounts payable and accrued expenses	(5,754)	604,049
Federal and state income taxes	220,740	255,215
Other liabilities	5,201	592
Total adjustments	(6,796)	1,625,170
Net cash provided by operating activities	$ 1,488,297	$ 2,292,505