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Difference Between US Federal Statutory Tax Rate and consolidated Effective Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Reconciliation of Statutory Federal Tax Rate [Line Items]
US federal statutory rate	35.00%	35.00%	35.00%	35.00%
Research and development credit	(39.60%)	(0.00%)	(24.00%)	(0.00%)
Reserves for uncertain tax positions	7.40%	(1.10%)	5.20%	0.20%
Out-of-period adjustments	7.00%	0.00%	4.00%	0.00%
Reversal to valuation allowance	0.00%	0.00%	(3.80%)	0.00%
Other	0.50%	(0.80%)	2.20%	2.00%
Effective tax rate	10.30%	33.10%	18.60%	37.20%

X

- Definition

Percentage 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 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 revisions of previously reported income tax expense.

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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 research tax credit.

+ References

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Effective Income Tax Rate Reconciliation, Uncertain Tax Positions

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Reconciliation of Statutory Federal Tax Rate [Line Items]

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