Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss attributable to New Relic	$ (40,893)	$ (45,320)	$ (61,077)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities, net of tax	969	(228)	(118)
Comprehensive loss	$ (39,924)	$ (45,548)	$ (61,195)