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Financial Instruments Measured at Fair Value - Effective Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Estimated Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less	$ 7,308	$ 7,421
Amortized Cost [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less	$ 7,297	$ 7,407

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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