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Goodwill and Intangible Assets - Schedule of Changes in Goodwill by Reportable Segments (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 15, 2021 | Jun. 30, 2021
Goodwill [Line Items] |  |
Balance, October 1, 2020 |  | $ 1,625,786
Foreign currency translation adjustment |  | 7,326
Balance, June 30, 2021 |  | 2,197,313
Arena Solutions |  |
Goodwill [Line Items] |  |
Goodwill, acquired | $ 562,800 | 562,838
Other Acquisitions |  |
Goodwill [Line Items] |  |
Goodwill, acquired |  | 1,363
Software Products |  |
Goodwill [Line Items] |  |
Balance, October 1, 2020 |  | 1,583,316
Foreign currency translation adjustment |  | 7,135
Balance, June 30, 2021 |  | 2,154,252
Software Products | Arena Solutions |  |
Goodwill [Line Items] |  |
Goodwill, acquired |  | 562,838
Software Products | Other Acquisitions |  |
Goodwill [Line Items] |  |
Goodwill, acquired |  | 963
Professional Services |  |
Goodwill [Line Items] |  |
Balance, October 1, 2020 |  | 42,470
Foreign currency translation adjustment |  | 191
Balance, June 30, 2021 |  | 43,061
Professional Services | Arena Solutions |  |
Goodwill [Line Items] |  |
Goodwill, acquired |  | 0
Professional Services | Other Acquisitions |  |
Goodwill [Line Items] |  |
Goodwill, acquired |  | $ 400

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