Consolidated Balance Sheets (Parenthetical) (USD $)	Apr. 27, 2011	Apr. 28, 2010
Current Assets:
Allowance for trade receivables	$ 10,909,000	$ 10,196,000
Allowances for other receivables	503,000	268,000
Capital stock:
Cumulative preferred stock, dividend per share	$ 1.7	$ 1.7
Cumulative preferred stock, par value	$ 10	$ 10
Common stock, shares issued	431,096,000	431,096,000
Common stock, par value	$ 0.25	$ 0.25
Convertible preferred stock into common stock, per share	15	15
Redeemable preferred stock, per share	$ 28.50	$ 28.50
Cumulative preferred stock, shares authorized for which the series has not been designated	2,200,000
Cumulative preferred stock, shares issued for which the series has not been designated	0
Equity (Less):
Treasury stock, shares	109,818,000	113,404,000