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Consolidated Statement of Stockholders' Equity (unaudited) (Parenthetical) (USD $)
Sep. 30, 2014
Mar. 31, 2015
Common stock issued @ $5.86    
Common stock issued, price per share $ 5.86us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtFiveDollarAndEightySixCentsPerShareMember
 
Common stock issued @ $18.95    
Common stock issued, price per share $ 18.95us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedAtEighteenDollarAndNinetyFiveCentsPerShareMember
 
Preferred stock issued at $1,000 per share    
Common stock issued, price per share $ 1,000us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= arwr_PreferredStockIssuedAtThousandDollarPerShareMember
 
Issued To Novartis At Seven Dollar And Fifty Three Cents Per Share    
Common stock issued, price per share   $ 7.53us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= arwr_IssuedToNovartisAtSevenDollarAndFiftyThreeCentsPerShareMember