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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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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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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
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-Section S99
-Paragraph 1
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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No definition available.

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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Marketable Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jan. 02, 2016
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost	$ 5,963		$ 5,963		$ 15,143
Unrealized gains	0		0		0
Unrealized losses	0		0		(23)
Fair value	5,963		5,963		15,120
Amortized Cost [Abstract]
Marketable debt securities - current (due in less than one year)	5,963		5,963		6,575
Marketable debt securities - non-current (due in one to two years)	0		0		8,568
Marketable debt securities Total Amortized Cost	5,963		5,963		15,143
Fair Value [Abstract]
Marketable debt securities - current (due in less than one year)	5,963		5,963		6,567
Marketable debt securities - non-current (due in one to two years)	0		0		8,553
Fair value	5,963		5,963		15,120
Proceeds from marketable debt securities	0	$ 59,200	15,100	$ 101,000
Corporate bonds [Member]
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost	3,212		3,212		7,532
Unrealized gains	0		0		0
Unrealized losses	0		0		(19)
Fair value	3,212		3,212		7,513
Amortized Cost [Abstract]
Marketable debt securities Total Amortized Cost	3,212		3,212		7,532
Fair Value [Abstract]
Fair value	3,212		3,212		7,513
Municipal bonds [Member]
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost					5,114
Unrealized gains					0
Unrealized losses					(3)
Fair value					5,111
Amortized Cost [Abstract]
Marketable debt securities Total Amortized Cost					5,114
Fair Value [Abstract]
Fair value					5,111
U.S. Agency bonds [Member]
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost					2,497
Unrealized gains					0
Unrealized losses					(1)
Fair value					2,496
Amortized Cost [Abstract]
Marketable debt securities Total Amortized Cost					2,497
Fair Value [Abstract]
Fair value					$ 2,496
US Treasury Securities [Member]
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost	2,004		2,004
Unrealized gains	0		0
Unrealized losses	0		0
Fair value	2,004		2,004
Amortized Cost [Abstract]
Marketable debt securities Total Amortized Cost	2,004		2,004
Fair Value [Abstract]
Fair value	2,004		2,004
Commercial Paper [Member]
Investments of marketable debt securities [Abstract]
Marketable debt securities Total Amortized Cost	747		747
Unrealized gains	0		0
Unrealized losses	0		0
Fair value	747		747
Amortized Cost [Abstract]
Marketable debt securities Total Amortized Cost	747		747
Fair Value [Abstract]
Fair value	$ 747		$ 747