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Discontinued Operations - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended 12 Months Ended
Jun. 04, 2014
Jan. 31, 2015
Apr. 30, 2014
Jun. 04, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from disposition $ 30,000,000us-gaap_ProceedsFromDivestitureOfBusinesses $ 30,000,000us-gaap_ProceedsFromDivestitureOfBusinesses    
Amount that will be placed into escrow as partial security for the Company's indemnification obligations       4,500,000us-gaap_EscrowDeposit
Loss on disposal of discontinued operations, net of taxes   (10,729,000)bv_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxIncludingPreviouslyRecognized    
Loss on disposal of discontinued operations, net of taxes, previously recognized     (9,192,000)bv_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPreviouslyRecognized  
Loss on disposal of discontinued operations, net of tax, recognized in current period   (1,537,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax    
Decrease in estimated cash proceeds     500,000bv_DiscontinuedOperationDecreaseInEstimatedCashProceeds  
Incremental transaction costs     400,000bv_DiscontinuedOperationsIncrementalTransactionCosts  
Assets held for sale   0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 33,745,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent  
Claims for indemnification received   $ 0bv_IndemnificationObligationResultingFromBreachOfAnyRepresentationWarrantyOrCovenantIndividualClaimThreshold