Financial Instruments Measured at Fair Value - Short-Term Investments by Security Type (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 200	$ 1,200	[1]
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	200	1,200
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 200	$ 1,200

[1] Derived from December 28, 2013 audited financial statements