Balance Sheet Information - Summary of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 26, 2014	Dec. 27, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 45,294us-gaap_InventoryRawMaterials	$ 49,515us-gaap_InventoryRawMaterials
Work in process	14,103us-gaap_InventoryWorkInProcess	19,437us-gaap_InventoryWorkInProcess
Finished goods	3,922us-gaap_InventoryFinishedGoods	1,815us-gaap_InventoryFinishedGoods
Inventory, gross	63,319us-gaap_InventoryGross	70,767us-gaap_InventoryGross
Reserve for excess and obsolete	(6,469)us-gaap_InventoryValuationReserves	(6,825)us-gaap_InventoryValuationReserves
Total	$ 56,850us-gaap_InventoryNet	$ 63,942us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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