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Cover
Sep. 30, 2023
Jan. 24, 2023
Cover [Abstract]    
Document Period End Date   Jan. 24, 2023
Document Type   8-K
Entity Registrant Name   Arrowhead Pharmaceuticals, Inc.
Entity File Number   001-38042
Entity Incorporation, State or Country Code   DE
Entity Tax Identification Number   46-0408024
Entity Address, Address Line One   177 E. Colorado Blvd
Entity Address, Address Line Two   Suite 700
Entity Address, City or Town   Pasadena
Entity Address, State or Province   CA
Entity Address, Postal Zip Code   91105
City Area Code   626
Local Phone Number   304-3400
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Common Stock, par value $0.001 per share
Trading Symbol   ARW
Security Exchange Name   NASDAQ
Entity Emerging Growth Company   false
Entity Central Index Key   0000879407
Amendment Flag   false
Current Fiscal Year End Date --09-30