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Variable Interest Entity - Additional Information (Detail) - USD ($) | Jun. 14, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 01, 2019 | Sep. 30, 2019
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Variable Interest Entity [Line Items] |  |  |  |  |
Goodwill |  | $ 41,471,000 | $ 37,754,000 | $ 807,000 | $ 36,947,000
Purchase Agreement |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of units acquired in exchange for other consideration | 24.90% |  |  |  |
Initial payment to the seller | $ 1,700,000 |  |  |  |
Non-refundable deposit to the seller | $ 4,200,000 |  |  |  |
Percentage of remaining units deposited into escrow with the seller legal counsel | 75.10% |  |  |  |
Additional amount paid to the seller upon FINRA's approval | $ 1,000,000.0 |  |  |  |
Amount already paid to the seller upon FINRA's approval | $ 200,000 |  |  |  |
Salomon Whitney LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of outstanding membership interests acquired | 100.00% |  |  |  |
Payment to acquire business | $ 7,000,000.0 |  |  |  |
Goodwill | $ 3,717,000 | $ 3,700,000 |  |  |

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