Net Loss Per Share - Computation of Net Loss Per Share Attributable to Common Stockholders, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss attributable to New Relic	$ (250,402)	$ (192,610)	$ (88,937)
Denominator:
Weighted-average shares used to compute net loss per share, basic (in shares)	64,592	61,070	58,601
Weighted-average shares used to compute net loss per share, diluted (in shares)	64,592	61,070	58,601
Net loss attributable to New Relic per share, basic (in usd per share)	$ (3.88)	$ (3.15)	$ (1.52)
Net loss attributable to New Relic per share, diluted (in usd per share)	$ (3.88)	$ (3.15)	$ (1.52)