Revenue Recognition - Impact on the Condensed Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Apr. 01, 2018	Mar. 31, 2018
Assets
Deferred contract acquisition costs, current	$ 25,275		$ 25,275			$ 0
Deferred contract acquisition costs, non-current	24,487		24,487			0
Liabilities:
Deferred revenue, current	200,231		200,231		$ 188,860	189,633
Deferred revenue, non-current	6,638		6,638		1,182	649
Stockholders' equity:
Accumulated deficit	(288,727)		(288,727)			$ (305,484)
Income Statement [Abstract]
Revenue	124,011	$ 91,827	347,128	$ 256,610
Sales and marketing	66,461	51,393	185,091	152,015
Loss from operations	(8,540)	(7,987)	(17,706)	(39,276)
Net loss attributable to New Relic	$ (10,103)	$ (7,729)	$ (24,054)	$ (38,354)
Net loss per share, basic and diluted (in usd per share)	$ (0.18)	$ (0.14)	$ (0.42)	$ (0.70)
Statement of Cash Flows [Abstract]
Depreciation and amortization			$ 38,585	$ 17,306
Deferred contract acquisition costs			(27,689)	$ 0
Net cash provided by operating activities			66,896
Balances without adoption of ASC 606
Assets
Deferred contract acquisition costs, current	$ 0		0
Deferred contract acquisition costs, non-current	0		0
Liabilities:
Deferred revenue, current	201,286		201,286
Deferred revenue, non-current	6,624		6,624
Stockholders' equity:
Accumulated deficit	(339,920)		(339,920)
Income Statement [Abstract]
Revenue	123,603		346,339
Sales and marketing	70,083		194,290
Loss from operations	(12,570)		(27,694)
Net loss attributable to New Relic	$ (14,133)		$ (34,042)
Net loss per share, basic and diluted (in usd per share)	$ (0.25)		$ (0.60)
Statement of Cash Flows [Abstract]
Depreciation and amortization			$ 20,095
Deferred contract acquisition costs			0
Net cash provided by operating activities			66,896
Effect of Change Higher (Lower) | Accounting Standards Update 2014-09
Assets
Deferred contract acquisition costs, current	$ 25,275		25,275
Deferred contract acquisition costs, non-current	24,487		24,487
Liabilities:
Deferred revenue, current	(1,055)		(1,055)
Deferred revenue, non-current	14		14
Stockholders' equity:
Accumulated deficit	51,193		51,193		$ 40,800
Income Statement [Abstract]
Revenue	408		789
Sales and marketing	(3,622)		(9,199)
Loss from operations	4,030		9,988
Net loss attributable to New Relic	$ 4,030		$ 9,988
Net loss per share, basic and diluted (in usd per share)	$ 0.07		$ 0.18
Statement of Cash Flows [Abstract]
Depreciation and amortization			$ 18,490
Deferred contract acquisition costs			(27,689)
Net cash provided by operating activities			$ 0