Revenue Recognition - Additional Information (Detail) (USD $)	9 Months Ended
	Jan. 26, 2013	Apr. 28, 2012	Jan. 28, 2012
Deferred Revenue Arrangement [Line Items]
Estimated life of NOOK, years	2
Nook
Deferred Revenue Arrangement [Line Items]
Recognized over	2 years
Deferred Revenue	$ 18,855,000	$ 19,785,000	$ 21,498,000
Nook | Minimum
Deferred Revenue Arrangement [Line Items]
Average Percent, NOOK's Sales price	2.00%
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	$ 25.00