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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Common Stock (Acquired from) Sold to Stock- holders
Accumulated Other Comprehensive Earnings (Losses)
Common Stock Related to ESOP
Beginning Balance at Dec. 26, 2015 $ 9,440,453 $ 770,175 $ 2,556,391 $ 9,041,497 $ 0 $ 26,268 $ (2,953,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive earnings 2,022,847     2,025,688   (2,841)  
Dividends per share (667,902)     (667,902)      
Contribution of shares to retirement plans 354,214 5,216 239,436   109,562    
Acquisition of shares from stockholders (960,262)       (960,262)    
Sale of shares to stockholders 330,040 1,283 54,120   274,637    
Retirement of shares 0 (13,476)   (562,587) 576,063    
Change for ESOP related shares (114,219)           (114,219)
Ending Balance at Dec. 31, 2016 10,405,171 763,198 2,849,947 9,836,696 0 23,427 (3,068,097)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive earnings 2,394,039     2,291,894   102,145  
Dividends per share (689,660)     (689,660)      
Contribution of shares to retirement plans 361,282 6,540 262,684   92,058    
Acquisition of shares from stockholders (1,751,864)       (1,751,864)    
Sale of shares to stockholders 283,222 677 27,016   255,529    
Retirement of shares 0 (36,975)   (1,367,302) 1,404,277    
Change for ESOP related shares 14,959           14,959
Remeasurement of deferred income taxes reclassified to retained earnings       (27,064)   27,064  
Ending Balance at Dec. 30, 2017 11,017,149 733,440 3,139,647 10,044,564 0 152,636 (3,053,138)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Comprehensive earnings 2,371,079     2,381,167   (10,088)  
Dividends per share (734,510)     (734,510)      
Contribution of shares to retirement plans 349,424 6,221 261,423   81,780    
Acquisition of shares from stockholders (1,405,872)       (1,405,872)    
Sale of shares to stockholders 307,933 1,380 56,934   249,619    
Retirement of shares 0 (25,596)   (1,048,877) 1,074,473    
Change for ESOP related shares (81,861)           (81,861)
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings       198,310   (198,310)  
Ending Balance at Dec. 29, 2018 $ 11,823,342 $ 715,445 $ 3,458,004 $ 10,840,654 $ 0 $ (55,762) $ (3,134,999)