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Liability Related to the Sale of Future Royalties - Activity (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Liability, Sale Of Future Royalties [Roll Forward] |  |  |
Beginning carrying value | $ 341,361 | $ 268,326 | $ 268,326
Milestone payment received | 0 |  | 50,000
Non-cash interest expense recognized | 10,915 | $ 12,612 | 23,035
Ending carrying value | $ 352,276 |  | $ 341,361

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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 Milestone Payment Received, Liability Related To Sale Of Future Royalties + References No definition available. + Details
Name: | arwr_MilestonePaymentReceivedLiabilityRelatedToSaleOfFutureRoyalties
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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