Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]
Foreign net operating loss carryforwards	$ 29,776
Deferred tax assets from net operating loss carryforwards	6,848	8,070
Undistributed earnings subject to federal income tax	254,540
Gross unrecognized tax benefits	19,687	19,155	18,099
Deferred tax assets, net	5,003	4,735
Interest and penalties	2,124	2,358
Increase in interest and penalties expense	$ 542