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Commitments and Contingencies - Incentive Fees (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Carried interest still subject to contingencies | $ 1,125,678 | $ 1,022,250
Incentive fees, unrecorded estimate | $ 281,419 | $ 255,562

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