Net Loss Per Share - Computation of Net Loss Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss attributable to New Relic	$ (15,169)	$ (5,615)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	57,944	56,183
Net loss attributable to New Relic per share - basic and diluted (in usd per share)	$ (0.26)	$ (0.10)