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		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net loss attributable to New Relic	$ (27,195)	$ (10,103)	$ (60,978)	$ (24,054)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	58,733	57,096	58,352	56,663
Net loss attributable to New Relic per share - basic and diluted (in usd per share)	$ (0.46)	$ (0.18)	$ (1.05)	$ (0.42)