Employees' Stock Incentive Plans and Management Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 25, 2012	Jan. 26, 2011	Jan. 25, 2012	Jan. 26, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield			3.70%	3.90%
Expected volatility			20.90%	20.50%
Weighted-average expected life (in years)			5.0	5.5
Risk-free interest rate			1.00%	1.70%
Employees Stock Incentive Plans And Management Incentive Plans (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 5.80	$ 5.36
Employees' Stock and Management Incentive Plans [Member]
Employees Stock Incentive Plans And Management Incentive Plans (Textuals) [Abstract]
Pre-tax compensation cost related to incentive plans recognized in SG&A	$ 8.5	$ 8.8	$ 27.0	$ 24.7
Tax benefit from compensation cost related to incentive Plans	2.8	2.8	8.9	7.9
After-tax compensation cost related to incentive plans recognized in SG&A	5.7	6.0	18.1	16.8
Stock Options [Member]
Employees Stock Incentive Plans And Management Incentive Plans (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures			1,649,119	1,730,515
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted to employees			457,783	473,056
Weighted average grant price of restricted stock unit			$ 52.28	$ 46.55
Long-term Performance Program [Member]
Employees Stock Incentive Plans And Management Incentive Plans (Textuals) [Abstract]
Pre-tax compensation cost related to incentive plans recognized in SG&A	3.2	5.7	14.2	18.3
Tax benefit from compensation cost related to incentive Plans	1.1	2.0	5.0	6.4
After-tax compensation cost related to incentive plans recognized in SG&A	$ 2.1	$ 3.7	$ 9.2	$ 11.9

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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 amount of expense, net of income tax, 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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No definition available.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 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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- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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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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