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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Operating activities:    
Net loss $ (25,596)us-gaap_NetIncomeLoss $ (39,485)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 9,169us-gaap_DepreciationDepletionAndAmortization 11,167us-gaap_DepreciationDepletionAndAmortization
Loss on disposal of discontinued operations, net of tax 1,537us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Stock-based expense 9,689us-gaap_ShareBasedCompensation 10,996us-gaap_ShareBasedCompensation
Revaluation of contingent consideration   (3,270)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationAsset1
Bad debt expense 2,126us-gaap_ProvisionForDoubtfulAccounts 1,433us-gaap_ProvisionForDoubtfulAccounts
Excess tax benefit related to stock-based expense (2)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (96)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Amortization of deferred financing costs 39us-gaap_AmortizationOfFinancingCosts  
Other non-cash expense 145us-gaap_OtherNoncashIncomeExpense 194us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:    
Accounts receivable (18,757)us-gaap_IncreaseDecreaseInAccountsReceivable (15,802)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other current assets (1,600)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (375)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other non-current assets (112)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (1,473)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable 844us-gaap_IncreaseDecreaseInAccountsPayable 475us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other current liabilities (2,391)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (2,214)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Deferred revenue 6,810us-gaap_IncreaseDecreaseInDeferredRevenue (1,185)us-gaap_IncreaseDecreaseInDeferredRevenue
Other liabilities, long-term (933)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (927)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash used in operating activities (19,032)us-gaap_NetCashProvidedByUsedInOperatingActivities (40,562)us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Acquisitions, net of cash acquired, and purchase of intangible asset   (670)bv_PaymentsForBusinessesAndIntangiblesAcquiredNetOfCashAcquired
Proceeds from sale of discontinued operations 25,500us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested  
Purchases of property, equipment and capitalized internal-use software development costs (9,250)us-gaap_PaymentsToAcquireProductiveAssets (8,506)us-gaap_PaymentsToAcquireProductiveAssets
Decrease in restricted cash 500us-gaap_IncreaseDecreaseInRestrictedCash  
Purchases of short-term investments (79,136)us-gaap_PaymentsToAcquireShortTermInvestments (34,517)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from maturities of short-term investments 55,767us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments 45,410us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments
Proceeds from sale of short-term investments 5,012us-gaap_ProceedsFromSaleOfShortTermInvestments 31,098us-gaap_ProceedsFromSaleOfShortTermInvestments
Net cash provided by (used in) investing activities (1,607)us-gaap_NetCashProvidedByUsedInInvestingActivities 32,815us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Proceeds from employee stock compensation plans 6,215us-gaap_ProceedsFromStockOptionsExercised 11,039us-gaap_ProceedsFromStockOptionsExercised
Proceeds from revolving line of credit 57,000us-gaap_ProceedsFromLinesOfCredit  
Payments on revolving line of credit (27,000)us-gaap_RepaymentsOfLinesOfCredit  
Deferred financing costs (706)us-gaap_PaymentsOfFinancingCosts  
Excess tax benefit related to stock-based expense 2us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 96us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by financing activities 35,511us-gaap_NetCashProvidedByUsedInFinancingActivities 11,135us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate fluctuations on cash and cash equivalents (1,019)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 259us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net change in cash and cash equivalents 13,853us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,647us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 31,934us-gaap_CashAndCashEquivalentsAtCarryingValue 25,045us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 45,787us-gaap_CashAndCashEquivalentsAtCarryingValue 28,692us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of other cash flow information:    
Cash paid for income taxes, net of refunds 832us-gaap_IncomeTaxesPaidNet 730us-gaap_IncomeTaxesPaidNet
Cash paid for interest $ 889us-gaap_InterestPaid