Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 01, 2015	Apr. 29, 2017	Apr. 30, 2016	Apr. 25, 2015
Tax Credit Carryforward [Line Items]
Foreign net operating loss carryforwards		$ 14,053
Undistributed earnings subject to federal income tax		121,347
Repatriation of foreign earnings	$ 200,000	200,000
Tax impact of repatriation of foreign earnings	$ 11,800	(2,406)	$ 12,300
Gross unrecognized tax benefits		14,211	13,560	$ 16,661
Deferred tax assets, deductibility of gross liabilities		3,883	3,800
Interest and penalties		1,568	$ 1,438
Increase in interest and penalties expense		$ 350
Foreign Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Expiration period		9 years
Capital Loss Carryforward [Member]
Tax Credit Carryforward [Line Items]
Expiration period		5 years