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Difference Between US Federal Statutory Tax Rate and consolidated Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Reconciliation of Statutory Federal Tax Rate [Line Items]
US federal statutory rate	35.00%	35.00%	35.00%
Research and development credit	(19.50%)	(0.00%)	(0.00%)
Reserves for uncertain tax positions	2.90%	3.50%	0.40%
Out-of-period adjustments	2.60%	4.50%	0.00%
States income taxes (net of federal benefit)	2.00%	3.80%	1.30%
Foreign taxes	(0.10%)	(0.40%)	(0.60%)
(Decrease) increase in valuation allowance	(2.30%)	(2.20%)	1.70%
Loss on closure of China	0.00%	0.00%	(2.10%)
Other	(0.80%)	(3.10%)	0.20%
Effective tax rate	19.80%	41.10%	35.90%

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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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