Amortizable Intangible Assets and Unamortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Apr. 29, 2017
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 25,498	$ 25,410
Accumulated Amortization	(24,782)	(23,991)
Total	716	1,419
Unamortizable intangible assets	309,294	309,294
Total amortizable and unamortizable, intangible assets	310,010	310,713	$ 310,205
Trade name
Intangible Assets by Major Class [Line Items]
Unamortizable intangible assets	293,400	293,400
Publishing contracts
Intangible Assets by Major Class [Line Items]
Unamortizable intangible assets	15,894	15,894
Technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	10,710	10,710
Accumulated Amortization	(10,099)	(9,691)
Total	$ 611	$ 1,019
Technology | Minimum
Intangible Assets by Major Class [Line Items]
Useful Life	5 years	5 years
Technology | Maximum
Intangible Assets by Major Class [Line Items]
Useful Life	10 years	10 years
Distribution contracts
Intangible Assets by Major Class [Line Items]
Useful Life	10 years	10 years
Gross Carrying Amount	$ 8,325	$ 8,325
Accumulated Amortization	(8,275)	(7,979)
Total	50	346
Other
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	6,463	6,375
Accumulated Amortization	(6,408)	(6,321)
Total	$ 55	$ 54
Other | Minimum
Intangible Assets by Major Class [Line Items]
Useful Life	3 years	3 years
Other | Maximum
Intangible Assets by Major Class [Line Items]
Useful Life	10 years	10 years