Amortized Cost and Fair Value of Available for Sale Securities by Expected Maturity (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013
Amortized Cost
Due in one year or less	$ 833,361,000	$ 824,780,000
Due after one year through five years	3,975,875,000	3,590,615,000
Due after five years through ten years	275,075,000	295,407,000
Due after ten years	138,825,000	165,127,000
Total	5,223,136,000	4,875,929,000
Amortized cost of available-for-sale securities	6,308,207,000	5,836,904,000
Fair Value
Due in one year or less	837,254,000	829,559,000
Due after one year through five years	3,995,357,000	3,609,115,000
Due after five years through ten years	271,311,000	288,421,000
Due after ten years	141,606,000	168,283,000
Total	5,245,528,000	4,895,378,000
Fair value of available-for-sale securities	6,476,602,000	5,991,486,000
Restricted investments
Amortized Cost
Amortized cost of available-for-sale securities	170,000,000	170,000,000
Fair Value
Fair value of available-for-sale securities	170,431,000	169,914,000
Equity securities
Amortized Cost
Amortized cost of available-for-sale securities	915,071,000	790,975,000
Fair Value
Fair value of available-for-sale securities	$ 1,060,643,000	$ 926,194,000