Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax [Line Items]
Income tax (expense) benefit		$ (4,221)	$ 447	$ (4,231)	$ 447
Omers Royalty Sale Agreement [Member]
Income Tax [Line Items]
Proceeds from Royalties Received	$ 200,000