Variable Interest Entities - Consolidated VIEs (Details) - USD ($)	Jan. 15, 2021	Mar. 31, 2021	Mar. 31, 2020
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		$ 1,136,519,000	$ 473,529,000
Total liabilities of consolidated VIEs		546,318,000	236,128,000
Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Proceeds from initial public offering	$ 276,000,000
Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		4,787,000	9,988,000
Total liabilities of consolidated VIEs		0	0
Deferred incentive fee revenue			$ 3,704,000
Hamilton Lane Advisors, L.L.C. | Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Proceeds from initial public offering	$ 7,520,000
Hamilton Lane Alliance Holdings I, Inc.
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs		$ 277,528,000