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Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Condensed Balance Sheet Statements Captions [Line Items]
Impairment true-up adjustment gain	$ 100
Depreciation expense	3,400	$ 9,700	$ 17,300	$ 32,800
Investments in equity securities	$ 350		$ 350		$ 300

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