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Revenue - Performance Obligation (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Revenue from Contract with Customer [Abstract] |  |
Remaining performance obligations | $ 77,198 | $ 91,135

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Namespace Prefix: | us-gaap_
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 + Details
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