Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) $ in Thousands	6 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2022	$ 761,067
Foreign currency translation adjustment	13,263
Balance at March 31, 2023	774,330
Scores
Goodwill [Roll Forward]
Balance at September 30, 2022	146,648
Foreign currency translation adjustment	0
Balance at March 31, 2023	146,648
Software
Goodwill [Roll Forward]
Balance at September 30, 2022	614,419
Foreign currency translation adjustment	13,263
Balance at March 31, 2023	$ 627,682