Employees' Stock Incentive Plans and Management Incentive Plans (Tables)

6 Months Ended

Oct. 28, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Six Months Ended
	October 28, 2012	October 26, 2011
Dividend yield	3.7%	3.7%
Expected volatility	19.4%	20.9%
Weighted-average expected life (in years)	7.0	5.0
Risk-free interest rate	1.0%	1.0%

Stock Option and Restricted Stock Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Second Quarter Ended				Six Months Ended
	October 28, 2012		October 26, 2011		October 28, 2012		October 26, 2011
	(In millions)
Pre-tax compensation cost	$	11.8	$	12.5	$	18.7	$	18.5
Tax benefit	4.1		4.4		6.2		6.1
After-tax compensation cost	$	7.7	$	8.1	$	12.5	$	12.4

LTPP [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Second Quarter Ended				Six Months Ended
	October 28, 2012		October 26, 2011		October 28, 2012		October 26, 2011
	(In millions)
Pre-tax compensation cost	$	2.4	$	5.4	$	11.1	$	11.0
Tax benefit	0.8		2.0		3.8		3.9
After-tax compensation cost	$	1.6	$	3.4	$	7.3	$	7.1