Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	3 Months Ended
Apr. 01, 2017	Apr. 02, 2016
Stock Options
Potentially Dilutive Securities Outstanding [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share	452	2,423
Restricted Stock Units (RSUs)
Potentially Dilutive Securities Outstanding [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share		940
Employee stock purchase plan
Potentially Dilutive Securities Outstanding [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share		81

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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