Expense recognized during the period for liability based awards.

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Percentage of grants with market-based vesting provisions.

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Percentage of grants with performance-based vesting provisions.

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- Definition

Represents percentages of employees target award.

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- Definition

Represents percentages of share based payment award that vests each year from the date of grant.

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No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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No definition available.

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- Definition

The intrinsic value of liability-based payment instruments, excluding stock (or unit) options, that vested during the reporting period as calculated by applying the disclosed pricing methodology.

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No definition available.

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- Definition

The weighted average balance sheet date fair value of SARs granted during the reporting period as calculated by applying the disclosed pricing methodology.

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No definition available.

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- Definition

Total stock-based compensation during the period for both equity and liability based awards.

+ References

No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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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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-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The intrinsic value of equity-based payment equity instruments, excluding stock or unit options, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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

-Publisher FASB

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-SubTopic 10

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-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

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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- Definition

Net number of share options (or share units) granted during the period.

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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)

-Number 123R

-Paragraph A240

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Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Oct. 27, 2012	Jul. 28, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Stock-Based Compensation [Abstract]
Total stock-based compensation expense recognized	$ 4.3		$ 1.9	$ 7.8	$ 3.1
Expense recognized for equity-based awards	3.3		1.7	7.0	3.3
Expense recognized for liability-based awards	$ 1.0		$ 0.2	$ 0.8	$ (0.2)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share (in dollars per share)		$ 7.88
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)				0.2
Risk-free interest rate (in hundredths)		0.75%
Dividend rate (in hundredths)		0.00%
Expected life		5 years
Stock price volatility (in hundredths)		84.00%
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				1 year
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				4 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)				0.2
Percentages of share based payment award percent vesting each year from date of grant (in hundredths)				25.00%
Fair value of vested performance-based units (in dollars per unit)				$ 16.18
Restricted Stock Units [Member] \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)				Less than 0.1
Fair value of vested performance-based units (in dollars per unit)				$ 13.99
Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				1 year
Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				4 years
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)				0.1
Percentage of grants with performance vesting (in hundredths)				80.00%
Percentage of grants with market-based vesting (in hundredths)				20.00%
Fair value of vested performance-based units (in dollars per unit)				$ 16.18
Fair value of granted performance-based shares (in dollars per share)				$ 11.97
Performance Awards [Member] \| Monte Carlo Valuation Model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested performance-based units (in dollars per unit)				$ 24.67
Fair value of granted performance-based shares (in dollars per share)				$ 15.41
Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentages of employees target award (in hundredths)				50.00%
Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentages of employees target award (in hundredths)				200.00%
Stock Appreciation Rights ("SARs") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (in hundredths)				0.75%
Dividend rate (in hundredths)				0.00%
Expected life				5 years
Stock price volatility (in hundredths)				83.80%
Fair value per share (in dollars per share)				$ 7.87
Equity instruments other than options, granted in period (in shares/units)				0.1
Percentages of share based payment award percent vesting each year from date of grant (in hundredths)				25.00%
Stock Appreciation Rights ("SARs") [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				1 year
Stock Appreciation Rights ("SARs") [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option				4 years
Performance-Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)				0.1