Goodwill and Other Intangible Assets - Balances of Other Intangible Assets Excluding Goodwill (Detail) - USD ($) $ in Thousands	Jan. 30, 2016	Apr. 25, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Copyrights, trade names and trademarks	$ 29,900	$ 17,600
Distribution agreement, customer lists and other	638,854	221,359
Less: Accumulated amortization	(146,539)	(113,934)
Net amortized intangible assets	492,315	107,425
Total identifiable intangible assets, net	$ 522,215	$ 125,025