Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 01, 2015	Apr. 30, 2016	Apr. 25, 2015	Apr. 26, 2014
Tax Credit Carryforward [Line Items]
Foreign net operating loss carryforwards		$ 14,007
Undistributed earnings subject to federal income tax		102,411
Repatriation of foreign earnings	$ 200,000	200,000
Tax impact of repatriation of foreign earnings	$ 11,800	12,300
Gross unrecognized tax benefits		13,560	$ 16,661	$ 17,256
Deferred tax assets, deductibility of gross liabilities		3,800	4,118
Deferred tax assets, net		42,692	38,844
Interest and penalties		1,438	$ 1,760
Increase in interest and penalties expense		$ 258
Foreign Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Expiration period		10 years
Capital Loss Carryforward [Member]
Tax Credit Carryforward [Line Items]
Expiration period		5 years