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Shareholders' Equity - Stock Options Valuation Assumptions and Methodology (Details) (Stock Options, USD $)	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
2010 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected volatility	66.15%	52.76%	85.83%
Average risk-free interest rate	0.39%	0.63%	0.60%
Dividend yield	2.94%	2.66%	3.49%
Expected life of options	7 years 2 months 5 days	7 years 0 months 11 days	7 years 0 months 11 days
Weighted-average grant-date fair value	$ 4.13	$ 4.27	$ 5.19
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected volatility	66.15%	63.55%	85.59%
Average risk-free interest rate	0.39%	0.35%	1.09%
Dividend yield	2.94%	2.84%	3.63%
Expected life of options	7 years 2 months 5 days	7 years 0 months 11 days	7 years 0 months 11 days
Weighted-average grant-date fair value	$ 4.13	$ 3.75	$ 5.88

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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