Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Deferred tax assets:
Accrued expenses	$ 5,087	$ 2,863
Stock-based compensation expense	9,342	8,840
Inventory	4,534us-gaap_DeferredTaxAssetsInventory	3,789us-gaap_DeferredTaxAssetsInventory
Other	2,886us-gaap_DeferredTaxAssetsOther	2,351us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	21,849us-gaap_DeferredTaxAssetsGross	17,843us-gaap_DeferredTaxAssetsGross
Valuation allowance	(1,049)	(1,050)
Total deferred tax assets net of valuation allowance	20,800us-gaap_DeferredTaxAssetsNet	16,793us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Property, plant and equipment	(61,057)	(41,631)
Prepaid expenses	(1,080)	(1,264)
Goodwill	(695)	(580)
Total deferred tax liabilities	(62,832)us-gaap_DeferredTaxLiabilities	(43,475)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities	$ (42,032)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (26,682)us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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