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Goodwill and Acquired Intangible Assets - Schedule of Goodwill and Acquired Intangible Assets (Parenthetical) (Details) | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Purchased Software |  |
Weighted average useful lives (in years) | 11 years | 11 years
Customer Lists and Relationships |  |
Weighted average useful lives (in years) | 11 years | 11 years
Trademarks and Trade Names |  |
Weighted average useful lives (in years) | 12 years | 12 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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