Summary of Significant Accounting Policies (Policies)	6 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Management believes it has made all necessary adjustments (which consisted of only normal recurring items) so that the condensed consolidated financial statements are presented fairly and that estimates made in preparing the condensed consolidated financial statements are reasonable and prudent. Results of operations for the three and six months ended September 30, 2024 are not necessarily indicative of the results that may be expected for the year ending March 31, 2025. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in HLI’s Annual Report on Form 10-K for the fiscal year ended March 31, 2024.
Accounting for Differing Fiscal Periods	Accounting for Differing Fiscal Periods The Partnerships primarily have a fiscal year end as of December 31, and the Company accounts for its investments in the Partnerships using a three-month lag due to the timing of financial information received from the investments held by the Partnerships. The Partnerships primarily invest in private equity funds, which generally require at least 90 days following the calendar year end to present audited financial statements. The Company records its share of capital contributions to and distributions from the Partnerships in investments in the Condensed Consolidated Balance Sheets during the three-month lag period. The results of the consolidated Variable Interest Entities (“VIEs”) are reported on a three-month lag, due to the timing of the receipt of related financial statements. The Company’s revenue earned from Partnerships, including both management and advisory fee revenue and incentive fee revenue, is not accounted for on a lag.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company utilizes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach, and cost approach). The levels of the hierarchy are described below: •Level 1: Values are determined using quoted market prices for identical financial instruments in an active market. •Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable. •Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for investments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective notes. The carrying amount of cash and cash equivalents, fees receivable, and accounts payable approximate fair value due to the immediate or short-term maturity of these financial instruments.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In October 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-06 - Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. The amendments in this ASU incorporate 14 of the 27 disclosure requirements published in SEC Release No. 33-10532 - Disclosure Update and Simplification into various topics within the Accounting Standards Codification (“ASC”). The amendments represent clarifications to, or technical corrections of, current requirements. For SEC registrants, the effective date for each amendment will be the date on which the SEC removes that related disclosure from its rules. Early adoption is prohibited. The amendments will be applied retrospectively to all prior periods presented in the condensed consolidated financial statements. The Company is currently assessing the impact of the new requirements. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. This ASU enhances segment disclosures primarily around significant segment expenses for both interim and annual periods. The amendments in this ASU are to be applied retrospectively and are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years after December 15, 2024. Early adoption is permitted. The Company is currently assessing the impact of the new requirements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, on a prospective basis, with early adoption permitted. The Company is currently assessing the impact of the new requirements. In March 2024, the SEC adopted final rules to require disclosures about certain climate-related information in registration statements and annual reports. In April 2024, the SEC issued an order to stay the rules pending the completion of judicial review of multiple petitions challenging the rules. The rules, if implemented, would require information about a registrant’s climate-related risks that are reasonably likely to have a material impact on its business, results of operations, or financial condition. The required information about climate-related risks will also include disclosure of a registrant’s greenhouse gas emissions, if material. In addition, the rules will require registrants to present certain climate-related financial metrics in their audited financial statements. The Company is currently assessing the impact of the new requirements should the rules be implemented. The Organization for Economic Co-operation and Development (“OECD”) has issued Pillar Two model rules introducing a new global minimum tax of 15%. While the U.S. has not yet adopted the Pillar Two rules, various other governments around the world are enacting similar legislation. The Company is not within the scope of the OECD Pillar Two model rules.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Sep. 30, 2024

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Management believes it has made all necessary adjustments (which consisted of only normal recurring items) so that the condensed consolidated financial statements are presented fairly and that estimates made in preparing the condensed consolidated financial statements are reasonable and prudent. Results of operations for the three and six months ended September 30, 2024 are not necessarily indicative of the results that may be expected for the year ending March 31, 2025. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in HLI’s Annual Report on Form 10-K for the fiscal year ended March 31, 2024.

Accounting for Differing Fiscal Periods

The Partnerships primarily have a fiscal year end as of December 31, and the Company accounts for its investments in the Partnerships using a three-month lag due to the timing of financial information received from the investments held by the Partnerships. The Partnerships primarily invest in private equity funds, which generally require at least 90 days following the calendar year end to present audited financial statements. The Company records its share of capital contributions to and distributions from the Partnerships in investments in the Condensed Consolidated Balance Sheets during the three-month lag period.

The results of the consolidated Variable Interest Entities (“VIEs”) are reported on a three-month lag, due to the timing of the receipt of related financial statements.

The Company’s revenue earned from Partnerships, including both management and advisory fee revenue and incentive fee revenue, is not accounted for on a lag.

Fair Value of Financial Instruments

The Company utilizes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach, and cost approach). The levels of the hierarchy are described below:

•Level 1: Values are determined using quoted market prices for identical financial instruments in an active market.

•Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable.

•Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

The Company uses these levels of hierarchy to measure the fair value of certain financial instruments on a recurring basis, such as for investments; on a non-recurring basis, such as for acquisitions and impairment testing; for disclosure purposes, such as for long-term debt; and for other applications, as discussed in their respective notes.

The carrying amount of cash and cash equivalents, fees receivable, and accounts payable approximate fair value due to the immediate or short-term maturity of these financial instruments.

Recent Accounting Pronouncements

In October 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-06 - Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative. The amendments in this ASU incorporate 14 of the 27 disclosure requirements published in SEC Release No. 33-10532 - Disclosure Update and Simplification into various topics within the Accounting Standards Codification (“ASC”). The amendments represent clarifications to, or technical corrections of, current requirements. For SEC registrants, the effective date for each amendment will be the date on which the SEC removes that related disclosure from its rules. Early adoption is prohibited. The amendments will be applied retrospectively to all prior periods presented in the condensed consolidated financial statements. The Company is currently assessing the impact of the new requirements.

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. This ASU enhances segment disclosures primarily around significant segment expenses for both interim and annual periods. The amendments in this ASU are to be applied retrospectively and are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years after December 15, 2024. Early adoption is permitted. The Company is currently assessing the impact of the new requirements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, on a prospective basis, with early adoption permitted. The Company is currently assessing the impact of the new requirements.

In March 2024, the SEC adopted final rules to require disclosures about certain climate-related information in registration statements and annual reports. In April 2024, the SEC issued an order to stay the rules pending the completion of judicial review of multiple petitions challenging the rules. The rules, if implemented, would require information about a registrant’s climate-related risks that are reasonably likely to have a material impact on its business, results of operations, or financial condition. The required information about climate-related risks will also include disclosure of a registrant’s greenhouse gas emissions, if material. In addition, the rules will require registrants to present certain climate-related financial metrics in their audited financial statements. The Company is currently assessing the impact of the new requirements should the rules be implemented.

The Organization for Economic Co-operation and Development (“OECD”) has issued Pillar Two model rules introducing a new global minimum tax of 15%. While the U.S. has not yet adopted the Pillar Two rules, various other governments around the world are enacting similar legislation. The Company is not within the scope of the OECD Pillar Two model rules.