Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2017	Jun. 09, 2017	Oct. 31, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	Bazaarvoice Inc
Entity Central Index Key	0001330421
Current Fiscal Year End Date	--04-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Apr. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	BV
Amendment Flag	false
Entity Common Stock, Shares Outstanding		84,287,847
Entity Public Float			$ 404