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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss attributable to New Relic	$ (10,103)	$ (7,729)	$ (24,054)	$ (38,354)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	57,096	55,196	56,663	54,534
Net loss attributable to New Relic per share - basic and diluted (in usd per share)	$ (0.18)	$ (0.14)	$ (0.42)	$ (0.70)