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Goodwill - Summary of Changes to Goodwill (Detail) $ in Thousands	6 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2023	$ 773,327
Foreign currency translation adjustment	3,049
Balance at March 31, 2024	776,376
Scores
Goodwill [Roll Forward]
Balance at September 30, 2023	146,648
Foreign currency translation adjustment	0
Balance at March 31, 2024	146,648
Software
Goodwill [Roll Forward]
Balance at September 30, 2023	626,679
Foreign currency translation adjustment	3,049
Balance at March 31, 2024	$ 629,728

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.

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