Goodwill - Summary of Changes to Goodwill (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2023	$ 773,327
Foreign currency translation adjustment	3,387
Balance at June 30, 2024	776,714
Scores
Goodwill [Roll Forward]
Balance at September 30, 2023	146,648
Foreign currency translation adjustment	0
Balance at June 30, 2024	146,648
Software
Goodwill [Roll Forward]
Balance at September 30, 2023	626,679
Foreign currency translation adjustment	3,387
Balance at June 30, 2024	$ 630,066