Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid in Capital	Retained Earnings	General Partnerships Noncontrolling Interests	Hamilton Lane Advisors, L.L.C. Noncontrolling Interests
Beginning balance at Mar. 31, 2021	$ 314,201	$ 36	$ 17	$ 150,564	$ 87,512	$ 2,211	$ 73,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	209,177				132,161	167	76,849
Equity-based compensation	5,706			3,870			1,836
Repurchase of Class A shares for employee tax withholding	(605)			(220)			(385)
Deferred tax adjustment	2,722			2,722
Dividends declared	(38,429)				(38,429)
Capital contributions from non-controlling interests, net	563					563
Member distributions	(32,361)						(32,361)
Secondary offerings	(1)	1	(1)	4,097			(4,098)
Employee Share Purchase Plan share issuance	1,382			936			446
Adjustment of redeemable non-controlling interest to redemption value	520				393		127
Equity reallocation between controlling and non-controlling interests	0			98			(98)
Ending balance at Dec. 31, 2021	462,875	37	16	162,067	181,637	2,941	116,177
Beginning balance at Sep. 30, 2021	404,252	37	16	161,000	141,130	2,904	99,165
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	77,911				51,849	(119)	26,181
Equity-based compensation	1,711			1,179			532
Repurchase of Class A shares for employee tax withholding	0
Deferred tax adjustment	2			2			0
Dividends declared	(12,916)				(12,916)
Capital contributions from non-controlling interests, net	156					156
Member distributions	(11,024)						(11,024)
Secondary offerings	0	0	0				0
Employee Share Purchase Plan share issuance	498			340			158
Adjustment of redeemable non-controlling interest to redemption value	2,285			0	1,574		711
Equity reallocation between controlling and non-controlling interests	0			(454)			454
Ending balance at Dec. 31, 2021	462,875	37	16	162,067	181,637	2,941	116,177
Beginning balance at Mar. 31, 2022	461,486	37	16	161,676	185,149	3,423	111,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	130,133				78,034	773	51,326
Equity-based compensation	6,816			4,702			2,114
Repurchase of Class A shares for employee tax withholding	(162)			(112)			(50)
Dividends declared	(44,413)				(44,413)
Capital contributions to non-controlling interests, net	(543)					(543)
Member distributions	(37,871)						(37,871)
Employee Share Purchase Plan share issuance	1,441	1		993			447
Adjustment of redeemable non-controlling interest to redemption value	13,071				9,016		4,055
Equity reallocation between controlling and non-controlling interests	0			(438)			438
Ending balance at Dec. 31, 2022	529,958	38	16	166,821	227,786	3,653	131,644
Beginning balance at Sep. 30, 2022	524,978	38	16	164,763	225,957	3,820	130,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,237				9,669	422	9,146
Equity-based compensation	2,835			1,956			879
Repurchase of Class A shares for employee tax withholding	(70)			(48)			(22)
Dividends declared	(14,810)				(14,810)
Capital contributions to non-controlling interests, net	(589)					(589)
Member distributions	(12,164)						(12,164)
Employee Share Purchase Plan share issuance	439	0		303			136
Adjustment of redeemable non-controlling interest to redemption value	10,102				6,970		3,132
Equity reallocation between controlling and non-controlling interests	0			(153)			153
Ending balance at Dec. 31, 2022	$ 529,958	$ 38	$ 16	$ 166,821	$ 227,786	$ 3,653	$ 131,644