Goodwill and Intangible Assets - Schedule of Changes in Goodwill by Reportable Segments (Details) $ in Thousands	6 Months Ended
Mar. 31, 2022 USD ($)
Goodwill [Line Items]
Balance, October 1, 2021	$ 2,191,887
Acquisitions	691
Foreign currency translation adjustment	(6,422)
Balance, March 31, 2022	2,186,156
Software Products
Goodwill [Line Items]
Balance, October 1, 2021	2,148,968
Acquisitions	691
Foreign currency translation adjustment	(6,296)
Balance, March 31, 2022	2,143,363
Professional Services
Goodwill [Line Items]
Balance, October 1, 2021	42,919
Acquisitions	0
Foreign currency translation adjustment	(126)
Balance, March 31, 2022	$ 42,793

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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