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Employees' Stock Incentive Plans and Management Incentive Plans Employees' Stock Incentive Plans and Management Incentive Plans (Tables)
6 Months Ended
Oct. 26, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 
Weighted average assumptions used to estimate fair values of option awards
The awards granted in the second quarter ended October 26, 2011 were sourced from the Fiscal Year 2003 Stock Incentive Plan. The awards granted in the second quarter ended October 27, 2010 were sourced from the 2000 Stock Option Plan and the Fiscal 2003 Stock Incentive Plan. The weighted average assumptions used to estimate the fair values are as follows:
 
Six Months Ended
 
October 26,
2011
 
October 27,
2010
Dividend yield
3.7%
 
3.9%
Expected volatility
20.9%
 
20.5%
Weighted-average expected life (in years)
5.0
 
5.5
Risk-free interest rate
1.0%
 
1.7%