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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jan. 26, 2013
Apr. 28, 2012
SHAREHOLDERS' EQUITY:    
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, authorized (in shares) 120,000,000 120,000,000
Common stock, issued (in shares) 42,373,947 41,930,116
Treasury stock, at cost (in shares) 19,680 19,680