Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jun. 30, 2026	Sep. 30, 2025
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 178,074	$ 156,566
U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	178,074	$ 156,566
Long Term Marketable Securities [Member] \| U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 21,987
Long Term Marketable Securities [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturity period of the marketable securities	2 years
Long Term Marketable Securities [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturity period of the marketable securities	1 year
Short Term Marketable Securities [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturity period of the marketable securities	1 year	1 year

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details