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

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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