Cash, Cash Equivalents and Short-term Investments - Short-Term Investments by Security Type (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 7,407
Gross Unrealized Gains		14
Gross Unrealized Losses
Estimated Fair Value	1,200	7,421
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,200	1,470
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	1,200	1,470
Government-Sponsored Enterprise Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,937
Gross Unrealized Gains		14
Gross Unrealized Losses
Estimated Fair Value		$ 5,951