v2.4.0.8
Marketable Securities (Classified as Available-For-Sale Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,700,619 $ 1,630,959
Gross Unrealized Gains 13,082 17,320
Gross Unrealized Losses-OTTI (57,356) [1] 0 [1]
Gross Unrealized Losses-Other (4,377) [2] (6,884) [2]
Estimated Fair Value (Net Carrying Amount) 1,651,968 1,641,395
Mortgage-Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 461,054 644,388
Gross Unrealized Gains 2,692 8,894
Gross Unrealized Losses-OTTI (22,614) [1] 0 [1]
Gross Unrealized Losses-Other (3,802) [2] (2,387) [2]
Estimated Fair Value (Net Carrying Amount) 437,330 650,895
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 673,529 499,241
Gross Unrealized Gains 1,601 2,345
Gross Unrealized Losses-OTTI (27,509) [1] 0 [1]
Gross Unrealized Losses-Other (267) [2] (1,729) [2]
Estimated Fair Value (Net Carrying Amount) 647,354 499,857
U.S. corporate bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 463,437 399,036
Gross Unrealized Gains 1,050 3,138
Gross Unrealized Losses-OTTI (7,031) [1] 0 [1]
Gross Unrealized Losses-Other (308) [2] (2,233) [2]
Estimated Fair Value (Net Carrying Amount) 457,148 399,941
Common Stock
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 24,540 21,113
Gross Unrealized Gains 5,413 2,392
Gross Unrealized Losses-OTTI (99) [1] 0 [1]
Gross Unrealized Losses-Other 0 [2] (523) [2]
Estimated Fair Value (Net Carrying Amount) 29,854 22,982
Other
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 78,059 67,181
Gross Unrealized Gains 2,326 551
Gross Unrealized Losses-OTTI (103) [1] 0 [1]
Gross Unrealized Losses-Other 0 [2] (12) [2]
Estimated Fair Value (Net Carrying Amount) $ 80,282 $ 67,720
[1] Represents impairment not related to credit for those investment securities that have been determined to be other-than-temporarily impaired.
[2] Represents unrealized losses on investment securities that have not been determined to be other-than-temporarily impaired.