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Commitments and Contingencies - Incentive Fees (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carried interest subject to contingencies | $ 441,150 | $ 326,466
Deferred incentive fee revenue | 3,704 | 3,704
Incentive fees, unrecorded estimate | 110,288 | 81,616
Carried Interest |  |
Loss Contingencies [Line Items] |  |
Deferred incentive fee revenue | $ 3,704 | $ 3,704

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- Definition Incentive Fee Compensation Expense, Unrecorded Estimate + References No definition available. + Details
Name: | hlne_IncentiveFeeCompensationExpenseUnrecordedEstimate
Namespace Prefix: | hlne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Incentive Fee Revenue, Carried Interest, Unrecorded Estimate + References No definition available. + Details
Name: | hlne_IncentiveFeeRevenueCarriedInterestUnrecordedEstimate
Namespace Prefix: | hlne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=hlne_CarriedInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |