Goodwill and Intangible Assets, net - Summary of Changes in Company's Goodwill (Detail) $ in Thousands	9 Months Ended
Jun. 30, 2026 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balance on beginning	$ 293,350
Fiscal year 2026 business combination	605
Balance on ending	$ 293,955

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details