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Equity Incentive Plan And Stock-Based Compensation (Schedule Of Weighted Average Fair Value Of Stock Options Granted) (Detail)
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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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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Expected volatility | 51.11% | 56.43% | 51.23% | 56.08% |
| Risk-free interest rate | 0.63% | 1.12% | 0.76% | 1.55% |
| Expected term (in years) | 4 years 4 months 6 days | 4 years 4 months 6 days | 4 years 4 months 6 days | 4 years 4 months 6 days |
| Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |