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

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- References

No definition available.

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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

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