Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 114,896,000	$ 84,685,000	$ 223,117,000	$ 164,783,000
Cost of revenue	18,447,000	15,694,000	35,497,000	30,671,000
Gross profit	96,449,000	68,991,000	187,620,000	134,112,000
Operating expenses:
Research and development	23,962,000	18,266,000	46,565,000	36,532,000
Sales and marketing	61,142,000	51,261,000	118,630,000	100,622,000
General and administrative	16,880,000	14,305,000	31,591,000	28,247,000
Total operating expenses	101,984,000	83,832,000	196,786,000	165,401,000
Loss from operations	(5,535,000)	(14,841,000)	(9,166,000)	(31,289,000)
Other income (expense):
Interest income	3,259,000	512,000	5,104,000	969,000
Interest expense	(5,597,000)	(21,000)	(8,263,000)	(43,000)
Other income (expense), net	(435,000)	(152,000)	(1,277,000)	162,000
Loss before income taxes	(8,308,000)	(14,502,000)	(13,602,000)	(30,201,000)
Income tax provision	225,000	189,000	546,000	424,000
Net loss:	(8,533,000)	(14,691,000)	(14,148,000)	(30,625,000)
Net loss attributable to redeemable non-controlling interest	197,000	0	197,000	0
Net loss attributable to New Relic	$ (8,336,000)	$ (14,691,000)	$ (13,951,000)	$ (30,625,000)
Net loss per share, basic and diluted (in usd per share)	$ (0.15)	$ (0.27)	$ (0.25)	$ (0.57)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	56,706	54,699	56,446	54,201