Goodwill and Intangible Assets - Additional Information (Details) $ in Thousands	6 Months Ended
Mar. 31, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)
Number of operating segments \| Segment	2
Number of reportable segments \| Segment	2
Intangible assets	$ 2,603,942	$ 1,863,356
Software Products
Intangible assets	2,558,700	1,818,100
Professional Services
Intangible assets	$ 45,200	$ 45,300

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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