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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jan. 31, 2015
Apr. 26, 2014
SHAREHOLDERS' EQUITY:    
Common stock, no par value (in dollars per share) $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, authorized (in shares) 120,000,000us-gaap_CommonStockSharesAuthorized 120,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued (in shares) 43,632,681us-gaap_CommonStockSharesIssued 43,166,731us-gaap_CommonStockSharesIssued
Treasury stock, at cost (in shares) 19,680us-gaap_TreasuryStockShares 19,680us-gaap_TreasuryStockShares