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		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss attributable to New Relic	$ (18,614)	$ (8,336)	$ (33,783)	$ (13,951)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	58,372	56,706	58,161	56,446
Net loss attributable to New Relic per share - basic and diluted (in usd per share)	$ (0.32)	$ (0.15)	$ (0.58)	$ (0.25)