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, 2020	Jun. 30, 2019
Numerator:
Net loss attributable to New Relic	$ (29,756)	$ (15,169)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	59,927	57,944
Net loss attributable to New Relic per share - basic and diluted (in usd per share)	$ (0.50)	$ (0.26)