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Liability Related to the Sale of Future Royalties - Activity (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Liability, Sale Of Future Royalties [Roll Forward] |  |
Carrying value as of September 30, 2023 | $ 268,326 |
Non-cash interest expense recognized | 17,705 | $ 13,064
Carrying value as of June 30, 2024 | $ 336,031 |

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- Definition Liability, Sale Of Future Royalties + References No definition available. + Details
Name: | arwr_LiabilitySaleOfFutureRoyaltiesRollForward
Namespace Prefix: | arwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-Cash Interest Expense, Liability Related To Sale Of Future Royalties + References No definition available. + Details
Name: | arwr_NonCashInterestExpenseLiabilityRelatedToSaleOfFutureRoyalties
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royalties, Liability, Noncurrent + References No definition available. + Details
Name: | arwr_RoyaltiesLiabilityNoncurrent
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant