Other Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jul. 25, 2014	Jul. 26, 2013
Compensation and Retirement Disclosure [Abstract]
Expenses related to investments of employee deferrals	$ 772
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 371	$ 158

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

No definition available.

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