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Liability Related to the Sale of Future Royalties - Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Liability, Sale Of Future Royalties [Roll Forward] |  |  |
Carrying value as of September 30, 2023 |  | $ 268,326 |
Non-cash interest expense recognized | $ 12,612 | 12,612 | $ 7,906
Carrying value as of March 31, 2024 | $ 280,938 | $ 280,938 |

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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