Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2022	Nov. 09, 2022
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2022
Entity File Number	001-39884
Entity Registrant Name	HAMILTON LANE ALLIANCE HOLDINGS I, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3019776
Entity Address, Address Line One	110 Washington Street, Suite 1300
Entity Address, City or Town	Conshohocken
Entity Address State Or Province	PA
Entity Address, Postal Zip Code	19428
City Area Code	610
Local Phone Number	934-2222
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Central Index Key	0001826814
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Transition Report	false
Units, each consisting of one Class A common stock, $0.0001 par value, and one-third of one redeemable warrant
Document and Entity Information
Title of 12(b) Security	Units, each consisting of one Class A common stock, $0.0001 par value, and one-third of one redeemable warrant
Trading Symbol	HLAHU
Security Exchange Name	NASDAQ
Class A common stock
Document and Entity Information
Title of 12(b) Security	Redeemable common stock as part of the units
Trading Symbol	HLAH
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		27,600,000
Warrants included as part of the units, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50
Document and Entity Information
Title of 12(b) Security	Warrants included as part of the units, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50
Trading Symbol	HLAHW
Security Exchange Name	NASDAQ
Class B common stock
Document and Entity Information
Entity Common Stock, Shares Outstanding		4,870,588

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Hamilton Lane Alliance Holdings I, Inc. 10-Q