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Cash, Cash Equivalents And Short Term Investments (Detail) - USD ($) $ in Thousands	Jul. 01, 2016	Jan. 01, 2016
Fair Value Measurements [Line Items]
Amortized Cost	$ 162,030	$ 171,699
Unrealized Gains	31	1
Unrealized Losses	0	(107)
Estimated Fair Value	162,061	171,593
U.S. Agency Securities
Fair Value Measurements [Line Items]
Amortized Cost	47,983	41,946
Unrealized Gains	31	1
Unrealized Losses	0	(106)
Estimated Fair Value	48,014	41,841
Cash
Fair Value Measurements [Line Items]
Amortized Cost	81,332	115,221
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	81,332	115,221
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	32,211	10,530
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	32,211	10,530
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	32,211	10,530
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	32,211	10,530
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	113,543	125,751
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	113,543	125,751
State and municipal bonds
Fair Value Measurements [Line Items]
Amortized Cost	504	4,002
Unrealized Gains	0	0
Unrealized Losses	0	(1)
Estimated Fair Value	504	4,001
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	48,487	45,948
Unrealized Gains	31	1
Unrealized Losses	0	(107)
Estimated Fair Value	$ 48,518	$ 45,842

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+ References

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=73527792&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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