Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (12)	$ 1,370	$ 727
Other comprehensive (loss) income	(1,173)	(1,382)	643
Ending Balance	(1,185)	(12)	1,370
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	244	908	508
Other comprehensive (loss) income	(139)	(664)	400
Ending Balance	105	244	908
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(256)	462	219
Other comprehensive (loss) income	(1,034)	(718)	243
Ending Balance	$ (1,290)	$ (256)	$ 462

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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