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Taxes - Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory corporate tax rate	21.00%	35.00%	21.00%	35.00%
State income taxes, net of federal benefit	1.00%	1.00%	1.00%	1.00%
Foreign tax rate differential	(7.00%)	(18.00%)	(7.00%)	(18.00%)
Tax credit	(0.00%)	(1.00%)	(0.00%)	(1.00%)
Discrete tax benefit related to Tax Act 2017	(9.00%)	0.00%	(4.00%)	0.00%
Discrete tax benefit related to stock option exercises	(4.00%)	(7.00%)	(5.00%)	(13.00%)
Other discrete tax events	(2.00%)	(2.00%)	(1.00%)	(1.00%)
Other	1.00%	1.00%	1.00%	1.00%
Income tax provision	1.00%	9.00%	6.00%	4.00%

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Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the income tax rates.

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Percentage 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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