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Employees' Stock Incentive Plans and Management Incentive Plans (Details) (USD $) In Millions	3 Months Ended
	Jul. 27, 2011	Jul. 28, 2010
Employees' Stock Incentive Plans and Management Incentive Plans [Abstract]
Compensation cost related to Employees Stock Incentive Plans and Management Incentive Plans recognized in SG&A	$ 6.0	$ 5.2
Tax benefit from compensation cost related to Employees' Stock Incentive Plans and Management Incentive Plans	1.7	1.6
Performance period in years for dividends paid	2 years
Number of Trading Days for LTTP Peer Group Company Stock Price	60 days
Compensation cost related to long-term performance program recognized in G & A	5.6	2.8
Tax benefit from compensation cost related to long-term performance program	$ 1.9	$ 0.9

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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