Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	General Partnerships Noncontrolling Interests	Hamilton Lane Advisors, L.L.C.	Hamilton Lane Advisors, L.L.C. Noncontrolling Interests
Beginning balance at Mar. 31, 2020	$ 237,401	$ 30	$ 22	$ 107,727	$ 47,090	$ (78)	$ 4,853		$ 77,757
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	104,200				58,263		(346)		46,283
Other comprehensive income	130					78			52
Equity-based compensation	5,330			3,251					2,079
Repurchase of Class A shares for employee tax withholding	(36)			(22)					(14)
Deferred tax adjustment	14,424			14,424
Dividends declared	(31,650)				(31,650)
Capital distributions to non-controlling interests, net	(2,421)						(2,421)
Member distributions	(28,599)								(28,599)
Secondary offerings	(4)	5	(4)	15,933				$ (15,938)
Employee Share Purchase Plan share issuance	1,077			658					419
Equity reallocation between controlling and non-controlling interests	0			593					(593)
Ending balance at Dec. 31, 2020	299,852	35	18	142,564	73,703	0	2,086		81,446
Beginning balance at Sep. 30, 2020	263,195	35	18	141,010	51,275	0	3,506		67,351
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	54,632				33,203		(68)		21,497
Other comprehensive income	0
Equity-based compensation	1,759			1,136					623
Repurchase of Class A shares for employee tax withholding	(4)			(4)					0
Deferred tax adjustment	0			0
Dividends declared	(10,775)				(10,775)
Capital distributions to non-controlling interests, net	(1,352)						(1,352)
Member distributions	(7,973)								(7,973)
Employee Share Purchase Plan share issuance	370			239					131
Equity reallocation between controlling and non-controlling interests	0			183					(183)
Ending balance at Dec. 31, 2020	299,852	35	18	142,564	73,703	0	2,086		81,446
Beginning balance at Mar. 31, 2021	314,201	36	17	150,564	87,512	0	2,211		73,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	209,177				132,161		167		76,849
Other comprehensive income	0
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			0	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	0	2,941		116,177
Beginning balance at Sep. 30, 2021	404,252	37	16	161,000	141,130	0	2,904		99,165
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	77,911				51,849		(119)		26,181
Other comprehensive income	0
Equity-based compensation	1,711			1,179					532
Deferred tax adjustment	2			2
Dividends declared	(12,916)				(12,916)
Capital contributions from non-controlling interests, net	156						156
Member distributions	(11,024)								(11,024)
Employee Share Purchase Plan share issuance	498			340					158
Adjustment of redeemable non-controlling interest to redemption value	2,285				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	$ 0	$ 2,941		$ 116,177