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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2017 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |
Effective tax rate | 15.80% |  | 15.40% | 12.90% | 12.90% |
U.S. statutory federal tax rate | 21.00% |  |  | 21.00% |  | 35.00%
Discrete tax benefits | $ 0.7 |  | $ 6.5 | $ 6.7 | $ 6.5 |
Discrete tax benefits, non-taxable foregn exchange gain | 0.7 |  | (0.7) | 1.1 | (0.3) |
Discrete tax benefits, net |  |  |  | 9.1 |  |
Discrete tax expense |  |  | 0.5 | 2.4 | 0.5 |
Discrete tax benefits, stock based compensation |  |  | 1.0 | 7.6 | 6.5 |
Discrete tax benefits, other |  |  | 0.2 | 0.4 | 0.6 |
Discrete tax expense, remeasurement of deferred tax assets |  |  |  | 1.7 |  |
Discrete tax expenses, Other |  |  |  | 0.7 |  |
Discrete tax expense, actuarial gains |  |  | $ 1.0 |  | 1.0 |
Discrete tax benefits, U.S research and development tax credits |  |  |  |  | 0.7 |
Uncertain tax positions | 37.9 | $ 36.3 |  | 37.9 |  | $ 36.3
Net Increase in uncertain tax positions | 1.6 |  |  |  |  |
Accrued interest and penalties | $ 0.3 | 0.3 |  | 0.3 |  | $ 0.3
Interest and penalties related to income tax, expense (benefit) |  |  |  | 0.1 | 0.1 |
Tax savings due to the tax holiday |  |  |  | $ 4.8 | $ 15.1 |
Tax savings due to the tax holiday, per share |  |  |  | $ 0.02 | $ 0.07 |
Tax holiday expiration date |  |  |  | December 31, 2020 |  |
Provisional amount of additional income tax expense |  | 186.0 |  |  |  |
Transition tax on mandatory deemed repatriation of foreign earnings |  | 161.0 |  |  |  |
Expense related to remeasurement of deferred tax assets and liabilities |  | 33.6 |  |  |  |
Benefit associated with impact of correlative adjustments on tax positions |  | 10.3 |  |  |  |
Expense related to remeasurement of certain deferred |  | $ 1.7 |  |  |  |

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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 research and development tax credit. + References No definition available. + Details
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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 nondeductible equity-based compensation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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