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Joint Venture - Narrative (Details)
¥ in Millions
Aug. 21, 2019
JPY (¥)
Aug. 21, 2019
USD ($)
Aug. 21, 2018
JPY (¥)
Aug. 21, 2018
USD ($)
Aug. 21, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]            
Redemption value of redeemable non-controlling interest           $ 0
Scenario, Forecast            
Schedule of Equity Method Investments [Line Items]            
Contributions for joint venture ¥ 104 $ 900,000        
The Investors            
Schedule of Equity Method Investments [Line Items]            
Contributions for joint venture     ¥ 396 $ 3,600,000    
New Relic K.K            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage, parent           60.00%
New Relic K.K | The Investors            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage, noncontrolling interest     40.00% 40.00%    
Maximum | The Investors | Scenario, Forecast            
Schedule of Equity Method Investments [Line Items]            
Additional investor contribution ¥ 156       $ 1,400,000