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Variable Interest Entity - Summary of Purchase Price Allocation of Purchase of Acquired Identifiable Assets, Liabilities Assumed and Goodwill (Detail) - USD ($) | Jun. 14, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 01, 2019 | Sep. 30, 2019
--- | --- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Accounts payable |  |  |  | $ 7,188,000 |
Accounts receivable |  |  |  | 4,838,000 |
Goodwill beginning |  | $ 41,471,000 | $ 37,754,000 | $ 807,000 | $ 36,947,000
Salomon Whitney [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total purchase price | $ 7,000,000 |  |  |  |
Accounts payable | 12,000 |  |  |  |
Accrued liabilities | 1,031,000 |  |  |  |
Total liabilities assumed | 1,043,000 |  |  |  |
Total consideration | 8,043,000 |  |  |  |
Accounts receivable | 756,000 |  |  |  |
Intangible assets | 3,570,000 |  |  |  |
Total assets acquired | 4,326,000 |  |  |  |
Goodwill beginning | $ 3,717,000 | $ 3,700,000 |  |  |

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