Stock-Based Compensation (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense			$ 9,376	$ 10,374
Selling And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted Stock Expense	4,052	4,987	8,131	9,897
Stock Option Expense	238	238	477	477
Stock-Based Compensation Expense	4,687	5,225	9,376	10,374
Restricted Stock Units (RSUs) [Member] | Selling And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted Stock Expense	$ 397		$ 768