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Cash, Cash Equivalents and Short-Term Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012
Investment [Line Items]
Variable rate demand note maturity year	2037
Variable rate demand notes [Member]
Investment [Line Items]
Securities amortized cost, Due in one year or less	1,500
Securities fair value, Due in one year or less	1,500

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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