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Note 4. Short-Term Investments (Details) - Short-Term Investments (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 29, 2014	Dec. 29, 2013
Note 4. Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	$ 45,449	$ 49,099
Fair Value	45,450	49,099
Unrealized Gain (Loss)	1	0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Note 4. Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	31,446	21,986
Fair Value	31,452	21,993
Unrealized Gain (Loss)	6	7
Corporate Bond Securities [Member]
Note 4. Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	11,841	27,113
Fair Value	11,838	27,106
Unrealized Gain (Loss)	(3)	(7)
Certificates of Deposit [Member]
Note 4. Short-Term Investments (Details) - Short-Term Investments [Line Items]
Amortized Cost	2,162
Fair Value	2,160
Unrealized Gain (Loss)	$ (2)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity 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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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

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