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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
	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%

X

- Definition

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 valuation allowance for deferred tax assets.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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