Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Aug. 01, 2015	Jan. 28, 2017	Jan. 30, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	23.20%	33.40%		31.90%	41.10%
Excess tax benefit from share-based payments recognized	$ 177			$ 2,169
Repatriation of foreign earnings			$ 200,000
Tax impact of repatriation of foreign earnings	$ (2,406)				$ 12,300