CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 644,355	$ 579,925
Short-term investments	753,054	915,579
Trade receivables	746,904	671,414
Inventories	1,802,941	1,876,519
Prepaid expenses	53,538	41,484
Total current assets	4,000,792	4,084,921
Long-term investments	5,762,493	5,517,732
Other noncurrent assets	505,286	583,149
Property, plant and equipment	13,500,434	13,085,492
Accumulated depreciation	(5,222,868)	(5,087,788)
Net property, plant and equipment	8,277,566	7,997,704
Total assets	18,546,137	18,183,506
Current liabilities:
Accounts payable	1,893,710	1,754,706
Accrued expenses:
Contributions to retirement plans	260,092	517,493
Self-insurance reserves	139,037	137,100
Salaries and wages	187,874	124,423
Other	316,624	329,420
Current portion of long-term debt	17,332	37,873
Federal and state income taxes	191,927	241,299
Total current liabilities	3,006,596	3,142,314
Deferred income taxes	346,544	360,952
Self-insurance reserves	220,044	218,598
Accrued postretirement benefit cost	113,197	113,461
Long-term debt	157,836	155,201
Other noncurrent liabilities	84,152	84,361
Total liabilities	3,928,369	4,074,887
Common stock related to Employee Stock Ownership Plan (ESOP)	3,455,345	3,053,138
Stockholders’ equity:
Common stock of $1 par value. Authorized 1,000,000 shares; issued 740,192 shares in 2018 and 733,440 shares in 2017	740,192	733,440
Additional paid-in capital	3,422,702	3,139,647
Retained earnings	10,754,548	10,044,564
Treasury stock at cost, 6,436 shares in 2018	(266,463)	0
Accumulated other comprehensive (losses) earnings	(69,068)	152,636
Common stock related to ESOP	(3,455,345)	(3,053,138)
Total stockholders’ equity	11,126,566	11,017,149
Noncontrolling interests	35,857	38,332
Total equity	14,617,768	14,108,619
Total liabilities and stockholders' equity	$ 18,546,137	$ 18,183,506