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Goodwill and Intangible Assets, net - Summary of Changes in Company's Goodwill (Detail)
$ in Thousands
9 Months Ended
Jun. 30, 2023
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Balance on beginning $ 254,110
Fiscal year 2023 business combinations 244
Balance on ending $ 254,354