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Equity Incentive Plan And Stock-Based Compensation (Weighted Average Fair Value Of Granted Stock Options) (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jul. 01, 2012
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Jun. 26, 2011
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Jul. 01, 2012
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Jun. 26, 2011
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| Weighted average fair value of stock options granted | $ 4.96 | $ 8.24 | $ 4.17 | $ 8.73 |