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Stock-Based Compensation - Stock Options Valuation Assumptions (Detail) - 12 months ended Apr. 28, 2013 - Outside Director [Member] - Stock Options [Member]
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rate 0.67%
Dividend yield 3.00%
Expected volatility 61.70%
Expected term (in years) 5 years