Goodwill - Schedule of Changes to Goodwill (Details) $ in Thousands	9 Months Ended
Jun. 30, 2026 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2025	$ 783,340
Foreign currency translation and other adjustments	8,475
Balance at June 30, 2026	791,815
Scores
Goodwill [Roll Forward]
Balance at September 30, 2025	146,648
Foreign currency translation and other adjustments	0
Balance at June 30, 2026	146,648
Software
Goodwill [Roll Forward]
Balance at September 30, 2025	636,692
Foreign currency translation and other adjustments	8,475
Balance at June 30, 2026	$ 645,167

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details