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Employees' Stock Incentive Plans and Management Incentive Plans 1 (Details) (USD $)
In Millions, except Share data
12 Months Ended 104 Months Ended 12 Months Ended
Apr. 27, 2011
Apr. 28, 2010
Apr. 29, 2009
Apr. 27, 2011
2000 Plan [Member]
Apr. 27, 2011
Restricted Stock [Member]
Apr. 27, 2011
2003 Plan [Member]
Apr. 27, 2011
Stock Option Awards Granted Fiscal 2004 Through 2006 [Member]
Apr. 27, 2011
Stock Option Awards Granted Fiscal 2006 Through Current [Member]
Employees Stock Incentive Plans And Management Incentive Plans (Textuals) [Abstract]                
Compensation cost related to Employees' Stock Incentive Plans and Management Incentive Plans recognized in G&A $ 32.7 $ 33.4 $ 37.9          
Tax benefit from compensation cost related to Employees' Stock Incentive Plans and Management Incentive Plans 10.4 10.3 12.8          
Number of shares authorized         9,440,000 18,869,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period One to four years              
Share-based Compensation Arrangement by Share-based Payment Award, Award Maximum Term             P10Y P7Y
Excess tax benefits reported as operating cash inflow 12.4 6.9 9.5          
Excess tax benefits reported as financing cash inflow $ 8.6 $ 2.4 $ 4.8          
Shares available for grant as stock options       0 4,908,000 6,230,000    
Number of stock option shares cancelled/forfeited and returned to the plan 73,000 26,000 2,901,000 7,465   (236,000)    
Number of stock option shares granted 1,733,135 1,768,000 1,551,000 10,117   8,343,000