Basis of Presentation and Summary of Significant Accounting Policies - Merchandise Inventories (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended
	Apr. 28, 2012 cost_pool	Jan. 28, 2012 cost_pool	Apr. 28, 2012 Change in Accounting Principle, Increase in Merchandise Inventory Cost Pools [Member]	Jul. 28, 2012 Change in Accounting Principle, Increase in Merchandise Inventory Cost Pools [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of Inventory Cost Pools	350	50
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results			$ 5.6
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income from Continuing Operations				3.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income				$ 3.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income Per Basic Share from Continuing Operations				$ 0.05
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income Per Diluted Share from Continuing Operations				$ 0.05