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Liability Related to the Sale of Future Royalties - Summary of the Liability Related to the Sale of Future Royalties (Detail) - Sale Of Future Royalties [Member] - OMERS Royalty Purchase Agreement [Member]
$ in Thousands
 9 Months Ended
Jun. 30, 2025
USD ($)
Nonmonetary Transaction [Line Items]  
Royalty liability - beginning balance $ 169,241
Royalty payable to purchaser (9,981)
Payments on royalty sale liability (17,375)
Interest expense, net of capitalized interest 5,813
Royalty liability - ending balance $ 147,698