Goodwill and Intangible Assets - Schedule of Changes in Goodwill by Reportable Segments (Details) $ in Thousands	3 Months Ended
Dec. 31, 2021 USD ($)
Goodwill [Line Items]
Balance, October 1, 2021	$ 2,191,887
Goodwill, acquired	691
Foreign currency translation adjustment	(2,698)
Balance, December 31, 2021	2,189,880
Software Products
Goodwill [Line Items]
Balance, October 1, 2021	2,148,968
Goodwill, acquired	691
Foreign currency translation adjustment	(2,645)
Balance, December 31, 2021	2,147,014
Professional Services
Goodwill [Line Items]
Balance, October 1, 2021	42,919
Goodwill, acquired	0
Foreign currency translation adjustment	(53)
Balance, December 31, 2021	$ 42,866

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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