Goodwill and Intangible Assets, net - Summary of Changes in Company's Goodwill (Detail) $ in Thousands	9 Months Ended
Jun. 30, 2025 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balance on beginning	$ 275,829
Fiscal year 2025 business combinations	17,715
Other	(194)
Balance on ending	$ 293,350

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