Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Apr. 25, 2015
Property, Plant and Equipment [Abstract]
Land	$ 11,585	$ 10,390
Buildings	111,386	109,064
Leasehold improvements	26,291	17,905
Furniture and equipment	169,110	130,348
Computer hardware and software	141,727	115,580
Construction-in-progress	95,450	51,800
Property and equipment, gross	555,549	435,087
Accumulated depreciation	(262,234)	(230,954)
Property and equipment, net	$ 293,315	$ 204,133