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Cash, cash equivalents and short-term investments (Detail) - USD ($) $ in Thousands	Dec. 29, 2017	Dec. 30, 2016
Fair Value Measurements [Line Items]
Amortized Cost	$ 196,791	$ 173,967
Unrealized Gains	0	0
Unrealized Losses	(393)	(245)
Estimated Fair Value	196,398	173,722
U.S. agency securities
Fair Value Measurements [Line Items]
Amortized Cost	71,997	59,000
Unrealized Gains	0	0
Unrealized Losses	(393)	(245)
Estimated Fair Value	71,604	58,755
Cash
Fair Value Measurements [Line Items]
Amortized Cost	115,052	93,049
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	115,052	93,049
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	9,742	21,918
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	9,742	21,918
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	9,742	21,918
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	9,742	21,918
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	124,794	114,967
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	124,794	114,967
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	71,997	59,000
Unrealized Gains	0	0
Unrealized Losses	(393)	(245)
Estimated Fair Value	$ 71,604	$ 58,755

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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=82897076&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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