Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2022	$ 761,067
Foreign currency translation adjustment	15,553
Balance at June 30, 2023	776,620
Scores
Goodwill [Roll Forward]
Balance at September 30, 2022	146,648
Foreign currency translation adjustment	0
Balance at June 30, 2023	146,648
Software
Goodwill [Roll Forward]
Balance at September 30, 2022	614,419
Foreign currency translation adjustment	15,553
Balance at June 30, 2023	$ 629,972