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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Roll Forward]    
Beginning Balance $ 761,067 $ 788,185
Foreign currency translation adjustment 12,260 (27,118)
Ending Balance 773,327 761,067
Software    
Goodwill [Roll Forward]    
Beginning Balance 614,419 641,537
Foreign currency translation adjustment 12,260 (27,118)
Ending Balance 626,679 614,419
Scores    
Goodwill [Roll Forward]    
Beginning Balance 146,648 146,648
Foreign currency translation adjustment 0 0
Ending Balance $ 146,648 $ 146,648