Revenue Recognition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 25, 2014	Apr. 27, 2013	Jan. 26, 2013
Deferred Revenue Arrangement [Line Items]
Estimated life of NOOK, years	2
Nook
Deferred Revenue Arrangement [Line Items]
Recognized over	2 years
Deferred revenue	$ 13,348	$ 15,331	$ 18,855
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	8.00%
Annual Fee
Deferred Revenue Arrangement [Line Items]
Non-refundable, after first 30 days, annual fee	$ 25