Variable Interest Entities - Consolidated VIEs (Details) - USD ($)	Jan. 15, 2021	Sep. 30, 2022	Mar. 31, 2022
Variable Interest Entity [Line Items]
Total VIE Assets		$ 1,387,742,000	$ 1,294,946,000
Total liabilities of consolidated VIEs		586,764,000	557,460,000
Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Proceeds from offering	$ 276,000,000
Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities of consolidated VIEs		0	0
Other liabilities		10,391,000	12,675,000
Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Total VIE Assets		34,582,000	10,036,000
Hamilton Lane Advisors, L.L.C. | Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Proceeds from offering	$ 7,520,000
Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Total VIE Assets		277,517,000	276,675,000
Other liabilities		$ 10,391,000	$ 12,675,000