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Employee 401(k) Savings Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Employer matching contribution, percent | 3.00% |  |
Employer 401(k) contribution | $ 1.4 | $ 1.3 | $ 1.3

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration