Goodwill and Intangible Assets, net - Summary of Changes in Company's Goodwill (Detail) $ in Thousands	6 Months Ended
Mar. 31, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance on beginning	$ 253,398
Fiscal year 2022 business combinations	1,444
Balance on ending	$ 254,842

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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