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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
12 Months Ended
Apr. 24, 2015
Apr. 25, 2014
Apr. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation cost $ 2,967us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 7,105us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 8,606us-gaap_EmployeeBenefitsAndShareBasedCompensation
Tax benefit recognized 228us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1,756us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,094us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total Intrinsic Value of Options 567us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 8,124us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 2,921us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Proceeds from issuance of stock awards and treasury stock 534us-gaap_ProceedsFromSaleOfTreasuryStock 13,432us-gaap_ProceedsFromSaleOfTreasuryStock 8,642us-gaap_ProceedsFromSaleOfTreasuryStock
Total Excess Tax Benefits 228bobe_TotalExcessTaxBenefitsFromOperatingAndFinancingCashFlows 1,756bobe_TotalExcessTaxBenefitsFromOperatingAndFinancingCashFlows 2,094bobe_TotalExcessTaxBenefitsFromOperatingAndFinancingCashFlows
Total Fair Value of Vested Shares 10,136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 7,813us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 8,268us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Number of Shares Available for Grant 1.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Unrecognized Compensation Cost, Period for Recognition 2 years 3 months 22 days    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Cost, Period for Recognition 2 years 0 months 90 days    
Restricted Stock Awards and Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit recognized 1,127us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
2,700us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
2,642us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
Unrecognized Compensation Cost 4,571us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
   
Total Fair Value of Granted Shares $ 4,649bobe_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
$ 9,340bobe_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
$ 7,245bobe_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= bobe_RestrictedStockAwardsAndUnitsMember
SERP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum discount from fair market value at date of grant 50.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
   
2010 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation, expiration period 10 years    
Performance Incentive Plan | Restricted Stock Awards and Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years