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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

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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

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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

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No definition available.

+ Details

Name:	arwr_RoyaltiesLiabilityNoncurrent
Namespace Prefix:	arwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant