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COMMON STOCK AND STOCK-BASED COMPENSATION - Stock Options Valuation Assumptions and Methodology (Details) (Stock options, USD $)	3 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
2010 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Average expected volatility	65.77%	66.15%
Average risk-free interest rate	0.65%	0.39%
Dividend yield	2.81%	2.94%
Expected life of options (in years)	7 years 7 months 10 days	7 years 2 months 5 days
Weighted-average grant-date fair value	$ 8.36	$ 4.13
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Average expected volatility	65.77%	66.15%
Average risk-free interest rate	0.65%	0.39%
Dividend yield	2.81%	2.94%
Expected life of options (in years)	7 years 7 months 10 days	7 years 2 months 5 days
Weighted-average grant-date fair value	$ 8.36	$ 4.13

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Publisher FASB

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Name Staff Accounting Bulletin (SAB)

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-Section D

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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