Gift Cards - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 26, 2013	Oct. 27, 2012	Oct. 26, 2013	Oct. 27, 2012	Apr. 27, 2013
Gift Cards [Line Items]
Gift card breakage	$ 5,840	$ 6,015	$ 11,672	$ 12,060
Gift card liabilities	$ 313,581	$ 297,191	$ 313,581	$ 297,191	$ 341,036