Net Loss Per Share - Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Net loss attributable to common stockholders:
Net loss attributable to Barracuda Networks, Inc.	$ (4,422)	$ (67,498)	$ (3,626)
Shares used to compute net loss per share attributable to common stockholders:
Weighted-average shares used to compute net loss per share, basic (in shares)	53,070	51,898	35,355
Weighted-average shares used to compute net loss per share, diluted (in shares)	53,070	51,898	35,355
Net loss per share attributable to Barracuda Networks, Inc. common stockholders:
Net loss per share, basic (in usd per share)	$ (0.08)	$ (1.30)	$ (0.10)
Net loss per share, diluted (in usd per share)	$ (0.08)	$ (1.30)	$ (0.10)