Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 43,489	$ 46,667
Unrealized Holdings Gains	10
Unrealized Holdings Losses	6	40
Fair Value	43,493	46,627
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,800	13,746
Fair Value	21,800	13,746
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,740	23,215
Unrealized Holdings Gains	5
Unrealized Holdings Losses	3	7
Fair Value	14,742	23,208
Short-term Investments \| Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,623	9,978
Unrealized Holdings Gains	2
Unrealized Holdings Losses	2	7
Fair Value	5,623	9,971
Short-term Investments \| Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,121	4,238
Unrealized Holdings Gains	1
Unrealized Holdings Losses	1
Fair Value	3,121	4,238
Short-term Investments \| U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,996	8,999
Unrealized Holdings Gains	2
Fair Value	5,998	8,999
Other Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,949	9,706
Unrealized Holdings Gains	5
Unrealized Holdings Losses	3	33
Fair Value	6,951	9,673
Other Long-term Investments \| Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,451	6,212
Unrealized Holdings Gains	5
Unrealized Holdings Losses	2	23
Fair Value	5,454	6,189
Other Long-term Investments \| U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,498	3,494
Unrealized Holdings Losses	1	10
Fair Value	1,497	3,484
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,414	6,208
Fair Value	7,414	6,208
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,787	7,538
Fair Value	11,787	$ 7,538
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,599
Fair Value	$ 2,599

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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