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Summary of Differences Between US Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate (Detail) | 3 Months Ended | 6 Months Ended
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Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016
Income Tax Disclosure [Abstract] |  |  |  |
US federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
State income taxes (net of federal benefit) | 1.80% | 0.80% | 2.40% | 0.10%
Cessation of Spanish operations | 0.40% | 0.00% | (16.00%) | 0.00%
Research and development credit | (1.10%) | (0.00%) | (2.20%) | (0.00%)
Tax shortfall on share-based awards | (0.80%) | 0.00% | 0.80% | 0.00%
Reserves for uncertain tax positions | 0.40% | 0.20% | 0.70% | 0.60%
Increase (decrease) in valuation allowance | 0.10% | (1.20%) | 1.20% | (9.40%)
Other | 0.70% | (3.30%) | 1.30% | 3.70%
Effective Tax Rate | 36.50% | 31.50% | 23.20% | 30.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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