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Summary of HNTE and R&D Benefit and Effect on Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 28, 2020 | Dec. 30, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
HNTE and R&D benefits | $ 4,235 | $ 6,060 | $ 7,277
Basic shares | 106,366 | 105,195 | 103,355
Diluted shares | 106,366 | 106,332 | 134,036
Basic | $ 0.04 | $ 0.06 | $ 0.07
Diluted | $ 0.04 | $ 0.06 | $ 0.05

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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