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Goodwill and Intangible Assets - Schedule of Changes in Goodwill by Reportable Segments (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 15, 2021	Mar. 31, 2021
Goodwill [Line Items]
Balance, October 1, 2020		$ 1,625,786
Foreign currency translation adjustment		4,226
Balance, March 31, 2021		2,193,632
Arena Solutions
Goodwill [Line Items]
Goodwill, acquired	$ 562,700	562,657
Other Acquisitions
Goodwill [Line Items]
Goodwill, acquired		963
Software Products
Goodwill [Line Items]
Balance, October 1, 2020		1,583,316
Foreign currency translation adjustment		4,116
Balance, March 31, 2021		2,151,052
Software Products | Arena Solutions
Goodwill [Line Items]
Goodwill, acquired		562,657
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		110
Balance, March 31, 2021		42,580
Professional Services | Arena Solutions
Goodwill [Line Items]
Goodwill, acquired		0
Professional Services | Other Acquisitions
Goodwill [Line Items]
Goodwill, acquired		$ 0

X

- Definition

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.

+ References

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))
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-SubTopic 20
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+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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