Employee Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 26, 2015	Apr. 27, 2014	Apr. 28, 2013
Employee Benefit Plan
Period of service for being covered under 401(k) plan	90 days
Expense for contributions for continuing operations related to the 401(k) plan	$ 1,484	$ 1,450	$ 1,443

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration