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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net (loss) income attributable to Arrowhead Pharmaceuticals, Inc.	$ (125,300)	$ 48,675	$ (258,164)	$ 7,350

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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