Supplemental Financial Information (Schedule Of Inventory) (Details) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Supplemental Financial Information [Abstract]
Work-in-progress	$ 17,438,000us-gaap_InventoryWorkInProcess	$ 15,847,000us-gaap_InventoryWorkInProcess
Finished goods	20,511,000us-gaap_InventoryFinishedGoods	15,227,000us-gaap_InventoryFinishedGoods
Inventory, net	37,949,000us-gaap_InventoryNet	31,074,000us-gaap_InventoryNet
Inventory reserves	7,800,000us-gaap_InventoryValuationReserves	6,600,000us-gaap_InventoryValuationReserves
Decreased in inventory reserves	$ 700,000	$ 1,800,000	$ 500,000

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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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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 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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Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

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