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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |
Deferred revenue, revenue recognized | $ 13.9 | $ 23.7 | $ 75.3 | $ 85.5 |
Unbilled receivables |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Unbilled contracts receivable | $ 13.7 |  | $ 13.7 |  | $ 13.1

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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