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Cover Page - USD ($)
 12 Months Ended
Mar. 31, 2020
May 26, 2020
Sep. 30, 2019
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 001-38021    
Entity Registrant Name HAMILTON LANE INCORPORATED    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-2482738    
Entity Address, Address Line One One Presidential Blvd.,    
Entity Address, Address Line Two 4th Floor    
Entity Address, City or Town Bala Cynwyd,    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19004    
City Area Code 610    
Local Phone Number 934-2222    
Title of 12(b) Security Class A Common Stock, $0.001 par value per share    
Trading Symbol HLNE    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 1,450,100,000
Documents Incorporated by Reference Part III of this Form 10-K incorporates by reference information from the registrant’s definitive proxy statement related to the 2020 annual meeting of stockholders.    
Entity Central Index Key 0001433642    
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Common Class A      
Entity Common Stock, Shares Outstanding   29,842,497  
Common Class B      
Entity Common Stock, Shares Outstanding   22,049,727