Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Jul. 27, 2013	Jul. 28, 2012
Stock-based compensation expense recognized consolidated statement of income
Equity-based awards expense	$ 3,193	$ 3,619
Liability-based awards expense (income)	1,904	(72)
Total stock-based compensation expense	$ 5,097	$ 3,547
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	174,595
Fair value assumptions [Abstract]
Risk-free interest rate (in hundredths)	0.84%
Dividend rate (in hundredths)	0.84%
Expected life	5 years
Stock price volatility (in hundredths)	81.30%
Fair value per share (in dollars per share)	$ 11.63
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	1 year
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	4 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)	141,546
Percentages of share based payment award percent vesting each year from date of grant (in hundredths)	25.00%
Fair value assumptions [Abstract]
Risk-free interest rate (in hundredths)	1.20%
Dividend rate (in hundredths)	0.79%
Expected life	4 years 10 months 24 days
Stock price volatility (in hundredths)	80.50%
Fair value per share (in dollars per share)	$ 12.56
Stock Appreciation Rights (SARs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	1 year
Stock Appreciation Rights (SARs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	4 years
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)	35,083
Percentage of grants with market-based vesting (in hundredths)	20.00%
Percentage of grants with performance vesting (in hundredths)	80.00%
Performance awards, performance period	3 years
Fair value per share (in dollars per unit)	$ 19.86
Performance Share Units [Member] \| Monte Carlo Valuation Model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share (in dollars per unit)	$ 27.78
Performance Share Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of grants with performance vesting (in hundredths)	50.00%
Performance Share Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of grants with performance vesting (in hundredths)	200.00%
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)	191,410
Fair value of granted performance-based shares (in dollars per share)	$ 18.58
Performance-Based Shares [Member] \| Monte Carlo Valuation Model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of granted performance-based shares (in dollars per share)	$ 26.08
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentages of share based payment award percent vesting each year from date of grant (in hundredths)	25.00%
Award common share equivalent	1
Fair value per share (in dollars per unit)	$ 20.34
Restricted Stock Units (RSUs) [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted in period (in shares/units)	122,007
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	1 year
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock-based award	4 years

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 that vests each year from the date of grant.

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Performance period to achieve certain financial goals relating to performance awards.

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The intrinsic value of liability-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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No definition available.

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For share-based compensation awards, this represents the common share equivalent per award share or unit.

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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.

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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).

+ References

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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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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.

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

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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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