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Commitments and Contingencies - Operating Lease by Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Operating lease asset | $ 27,785 | $ 31,610
Operating lease liability | $ 29,569 | $ 33,302

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Balance Type: | credit
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Balance Type: | debit
Period Type: | instant