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Summary of Significant Accounting Policies - Transaction Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounting Policies [Abstract] |  |  |  |
Business combination acquisition costs | $ 321 | $ 15 | $ 3,374 | $ 42
Other | 0 | 0 | 160 | 0
Transaction costs | $ 321 | $ 15 | $ 3,534 | $ 42

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- Definition Business Combination, Acquisition Related Costs, Net + References No definition available. + Details
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- Definition Business Combination, Acquisition Related Costs, Other + References No definition available. + Details
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- References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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