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Shareholders' Equity - Weighted- Average Assumptions for Determining Fair Value (Detail) (USD $)
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3 Months Ended |
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Apr. 28, 2012
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
| Expected life | 4 years |
| Expected volatility | 87.00% |
| Risk-free interest rate | 0.92% |
| Expected dividends |