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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Apr. 01, 2018
Disaggregation of Revenue [Line Items]      
Cumulative effect adjustment on APIC $ 107,727 $ 92,482  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Disaggregation of Revenue [Line Items]      
Cumulative effect adjustment on APIC     $ 411
Cumulative effect adjustment on retained earnings     20
Hamilton Lane Advisors, L.L.C.      
Disaggregation of Revenue [Line Items]      
Cumulative effect adjustment on retained earnings 47,090 17,686  
Cumulative effect adjustment on equity $ 77,757 $ 53,780  
Hamilton Lane Advisors, L.L.C. | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Disaggregation of Revenue [Line Items]      
Cumulative effect adjustment on equity     $ 566