Gift Cards - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Apr. 28, 2012
Gift Cards [Line Items]
Gift card breakage	$ 6,045	$ 5,295
Gift card liabilities	$ 312,855	$ 301,249	$ 321,362