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v3.20.1

Summary of Significant Accounting Policies - Compensation and Benefits (Details) | 12 Months Ended
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Mar. 31, 2020
Accounting Policies [Abstract] |
Incentive fee compensation percentage | 25.00%

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- Definition Incentive Fee Compensation, Percentage + References No definition available. + Details
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Namespace Prefix: | hlne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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