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Nature of Business and Summary - Investment related (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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Accounting Policies [Abstract] |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 1.3 | $ 1.1

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details
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