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Employee Benefits (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	100.00%	100.00%
Fair value of our plan assets by asset category	$ 67,760	$ 63,896	$ 68,725
Equity securities - domestic
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	56.00%	47.00%
Equity securities - domestic | Level 1
Asset allocation structure of the portfolio
Fair value of our plan assets by asset category	37,623	30,179
Equity securities - international
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	9.00%	5.00%
Equity securities - international | Level 1
Asset allocation structure of the portfolio
Fair value of our plan assets by asset category	6,304	2,843
Fixed income
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	31.00%	45.00%
Fixed income | Level 1
Asset allocation structure of the portfolio
Fair value of our plan assets by asset category	20,848	28,975
Other
Asset allocation structure of the portfolio
Percentage of fair value of total assets by asset category	4.00%	3.00%
Other | Level 1
Asset allocation structure of the portfolio
Fair value of our plan assets by asset category	$ 2,985	$ 1,899

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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