Amortized Cost and Fair Value of Available for Sale Securities by Expected Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Amortized Cost
Due in one year or less	$ 824,780	$ 792,946
Due after one year through five years	3,590,615	2,725,036
Due after five years through ten years	295,407	520,800
Due after ten years	165,127	218,695
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	4,875,929	4,257,477
Amortized cost of available-for-sale securities	5,836,904	4,938,090
Fair Value
Due in one year or less	829,559	797,260
Due after one year through five years	3,609,115	2,755,043
Due after five years through ten years	288,421	526,924
Due after ten years	168,283	226,703
Fair value of available for sale securities, debt	4,895,378	4,305,930
Fair value of available-for-sale securities	5,991,486	5,033,106
Restricted investments
Amortized Cost
Amortized cost of available-for-sale securities	170,000	170,000
Fair Value
Fair value of available-for-sale securities	169,914	170,431
Equity securities
Amortized Cost
Amortized cost of available-for-sale securities	790,975	510,613
Fair Value
Fair value of available-for-sale securities	$ 926,194	$ 556,745