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Subsequent Events	6 Months Ended
	Mar. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	NOTE 11. SUBSEQUENT EVENTS On April 5, 2012, the Company entered into a Stock Purchase Agreement to purchase all of the outstanding shares of Alvos Therapeutics, Inc., ("Alvos"), a privately held company that licensed a large platform of proprietary human-derived homing peptides, and the method for their delivery, from MD Anderson Cancer Center. In conjunction with the acquisition, Arrowhead hired one employee from Alvos, and retained one employee on a consulting basis. In exchange for all of the outstanding shares of Alvos, Arrowhead issued an upfront payment of 315,467 shares of Arrowhead Common Stock, which shares were issued in a private placement under Section 4(2) of the Securities Act of 1933 and are deemed to be restricted securities. The former Alvos stockholders are also eligible to receive additional issuances of stock valued at up to $23.5 million at the time of issuance based on the future achievement of clinical, regulatory and sales milestones

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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