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Amortized Cost and Fair Value of Available for Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 90,995	$ 67,702
Gross Unrealized Gains	1,414	931
Gross Unrealized Losses	7	145
Fair Value	92,402	68,488
Money market investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,865	1,989
Fair Value	2,865	1,989
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,175	3,017
Gross Unrealized Gains	73	61
Gross Unrealized Losses		18
Fair Value	2,248	3,060
Corporate bonds and direct obligations of government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,173	51,014
Gross Unrealized Gains	1,294	819
Gross Unrealized Losses	6	126
Fair Value	70,461	51,707
U.S. Treasury Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,782	11,682
Gross Unrealized Gains	47	51
Gross Unrealized Losses	1	1
Fair Value	$ 16,828	$ 11,732

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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