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Commitments and Contingencies - Incentive Fees (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration