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Reconciliation of Provision for Income Taxes at Statutory Federal Income Tax Rate Compared to Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2020 | Dec. 30, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax benefit (provision) | $ 9,718 | $ (7,209) | $ (9,909)
State income taxes, net of federal benefit and state tax credits | (2,674) | (3,163) | (1,953)
Transfer pricing |  |  | 1,483
Acquisition related expenses |  |  | (1,737)
IRC Section 162(m) limitation | (712) | (868) | (3,702)
Stock options | (1,298) | (252) | 1,072
Global Intangible Low-Taxed Income | (1,300) |  |
Permanently reinvested earnings assertion | (1,442) | (1,765) | (14,313)
Foreign tax differential on foreign earnings & other permanent items | 3,933 | 687 | (3,685)
Change in valuation allowance | (2,668) | 2,127 | 118,451
Uncertain tax positions | 36,936 | 999 | (954)
Federal research and development credits | 4,250 | 4,582 | 2,996
Goodwill impairment | (14,532) |  |
Other | (320) | 2,457 | 458
Income tax benefit (provision) | $ 29,891 | $ (2,405) | $ 88,207

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120385591&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794 + Details
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