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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2013
Issuance of common stock upon initial public offering, offering costs $ 3,069newr_StockIssuanceCosts  
Series E Preferred Stock [Member] | Convertible Preferred Stock [Member]    
Issuance of convertible preferred stock, issuance cost   233newr_TemporaryEquityStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ConvertiblePreferredStockMember
Series F Convertible Preferred Stock [Member] | Convertible Preferred Stock [Member]    
Issuance of convertible preferred stock, issuance cost $ 2,757newr_TemporaryEquityStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ConvertiblePreferredStockMember