Revenue Recognition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 26, 2013	Apr. 27, 2013	Oct. 27, 2012
Deferred Revenue Arrangement [Line Items]
Estimated life of NOOK, years	2
Nook
Deferred Revenue Arrangement [Line Items]
Recognized over	2 years
Deferred revenue	$ 12,816	$ 15,331	$ 15,946
Nook | Minimum
Deferred Revenue Arrangement [Line Items]
Average percent, NOOK's sales price	3.00%
Nook | Maximum
Deferred Revenue Arrangement [Line Items]
Average percent, NOOK's sales price	6.00%
Annual Fee
Deferred Revenue Arrangement [Line Items]
Non-refundable, after first 30 days, annual fee	$ 25