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Collateralized Transactions - Cash and Securities Segregated (Details) - USD ($) $ in Thousands | Aug. 31, 2025 | Nov. 30, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations | $ 1,111,620 | $ 1,132,612

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- Definition Cash and securities deposited in a special reserve account for the exclusive benefit of customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration