Investments - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 29, 2014 AFS_security	Mar. 30, 2013	Dec. 28, 2013
Investments, Debt and Equity Securities [Abstract]
Total realized gains on sales of AFS securities	$ 6,173,000	$ 6,862,000
Total realized losses on sales of AFS securities	571,000	4,203,000
Other-than-temporary impairment losses	0	0
Number of AFS securities issues contributing to total unrealized loss	332
Total, unrealized Losses	$ 14,294,000		$ 17,766,000