Variable Interest Entities - Consolidated VIEs (Details) - USD ($)	Jan. 15, 2021	Dec. 31, 2021	Mar. 31, 2021
Variable Interest Entity [Line Items]
Total VIE Assets		$ 1,279,453,000	$ 1,136,519,000
Total liabilities of consolidated VIEs		540,578,000	546,318,000
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		16,122,000	17,310,000
Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Total VIE Assets		8,294,000	4,787,000
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		276,864,000	277,528,000
Other liabilities		$ 16,122,000	$ 17,310,000