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Liability Related to the Sale of Future Royalties - Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Liability, Sale Of Future Royalties [Roll Forward] |  |  |
Beginning carrying value | $ 341,361 | $ 268,326 |
Upfront payment received | 0 | 0 |
Milestone payment received | 0 | 50,000 |
Non-cash interest expense recognized | 26,036 | 23,035 | $ 18,326
Ending carrying value | $ 367,397 | $ 341,361 | $ 268,326

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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 Noncash 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

X
- Definition Upfront Payment Received, Liability Related To Sale Of Future Royalties + References No definition available. + Details
Name: | arwr_UpfrontPaymentReceivedLiabilityRelatedToSaleOfFutureRoyalties
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration