Stock-Based Compensation (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended
Jul. 28, 2012	Jul. 30, 2011
Stock-Based Compensation [Abstract]
Total stock-based compensation expense recognized	$ 3,500,000	$ 1,200,000
Expense recognized for equity-based awards	3,600,000	1,600,000
Expense recognized for liability-based awards	100,000	400,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 7.87
Compensation expense for all equity based compensation	$ 3,619,000	$ 1,559,000
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)	83.80%
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option	4 years
Stock Options [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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares)	0.2
Percentages of share based payment award vested during the period (in hundredths)	25.00%
Restricted Stock Units [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] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock option	1 year
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares)	0.1
Percentage of grants with performance vesting (in hundredths)	80.00%
Percentage of grants with market-based vesting (in hundredths)	20.00%
Number of time simulations are repeated	100,000
Fair value of vested performance-based units (in dollars per unit)	$ 12.09
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)	$ 15.73
Fair value of granted performance-based shares (in dollars per share)	$ 15.41
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%
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%
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)	84.00%
Fair value per share (in dollars per share)	$ 7.88
Equity instruments other than options, granted in period (in shares)	0.1
Percentages of share based payment award vested during the period (in hundredths)	25.00%
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
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
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)	0.1

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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Represents percentages of employees target award.

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Represents percentages of share based payment award vested during the period.

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

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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.

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

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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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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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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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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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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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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