CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 561,930	$ 579,925
Short-term investments	665,338	915,579
Trade receivables	630,061	671,414
Inventories	1,799,055	1,876,519
Prepaid expenses	54,626	41,484
Total current assets	3,711,010	4,084,921
Long-term investments	5,963,551	5,517,732
Other noncurrent assets	509,922	583,149
Property, plant and equipment	13,770,113	13,085,492
Accumulated depreciation	(5,377,734)	(5,087,788)
Net property, plant and equipment	8,392,379	7,997,704
Total assets	18,576,862	18,183,506
Current liabilities:
Accounts payable	1,730,965	1,754,706
Accrued expenses:
Contributions to retirement plans	347,469	517,493
Self-insurance reserves	140,001	137,100
Salaries and wages	235,457	124,423
Other	368,487	329,420
Current portion of long-term debt	17,573	37,873
Federal and state income taxes	24,040	241,299
Total current liabilities	2,863,992	3,142,314
Deferred income taxes	363,936	360,952
Self-insurance reserves	222,058	218,598
Accrued postretirement benefit cost	113,297	113,461
Long-term debt	169,604	155,201
Other noncurrent liabilities	72,542	84,361
Total liabilities	3,805,429	4,074,887
Common stock related to Employee Stock Ownership Plan (ESOP)	3,250,318	3,053,138
Stockholders’ equity:
Common stock of $1 par value. Authorized 1,000,000 shares; issued 740,193 shares in 2018 and 733,440 shares in 2017	740,193	733,440
Additional paid-in capital	3,422,708	3,139,647
Retained earnings	11,180,065	10,044,564
Treasury stock at cost, 12,921 shares in 2018	(536,886)	0
Accumulated other comprehensive (losses) earnings	(70,679)	152,636
Common stock related to ESOP	(3,250,318)	(3,053,138)
Total stockholders’ equity	11,485,083	11,017,149
Noncontrolling interests	36,032	38,332
Total equity	14,771,433	14,108,619
Total liabilities and stockholders' equity	$ 18,576,862	$ 18,183,506