Income Taxes - Reconciliation of Income Taxes at Statutory Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal taxes at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.20%	1.60%	1.70%
Research and development tax credit	(0.40%)	(0.70%)	(0.30%)
Other	0.20%		(0.20%)
Effective tax rate	36.00%	35.90%	36.20%

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 other adjustments.

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