Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2017	Mar. 31, 2017
Common Stock, Par or Stated Value Per Share		$ 0.10	$ 0.10
Receivables:
Fixed assets, net		$ 148,859	$ 159,662
Current Liabilities
REDEEMABLE NONCONTROLLING INTERESTS		$ 727,706	$ 677,772
STOCKHOLDERS' EQUITY
Common Stock, Shares Authorized		500,000,000	500,000,000
Common Stock, Shares, Issued		84,490,108	107,011,664
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Current Assets
Cash and Cash Equivalents		$ 680,322	$ 733,709
Receivables:
Investment securities	[1]	409,369	423,619
Other current assets		72,744	74,102
Current Liabilities
Other current liabilities		100,519	117,863
Consolidated Investment Vehicles [Member]
Current Assets
Cash and Cash Equivalents		4,325	651
Receivables:
Investment securities		126,942	49,901
Other current assets		1,694	0
Other non-current assets		9,172	9,987
Current Liabilities
Other current liabilities		487	736
Consolidated Legg Mason, Inc.
Current Assets
Restricted cash		17,605	16,046
Receivables:
Investment advisory and related fees		482,652	433,192
Other receivables		53,105	70,527
Total Current Assets		1,848,758	1,801,747
Fixed assets, net		148,859	159,662
Intangible assets, net		3,800,885	4,034,380
Goodwill		1,925,650	1,924,889
Deferred income taxes		204,787	202,843
Other non-current assets		137,055	156,907
TOTAL ASSETS		8,075,166	8,290,415
Current Liabilities
Accrued compensation		390,976	486,679
Accounts Payable and Accrued Liabilities, Current		198,481	181,793
Line of Credit, Current		225,500	0
Business Combination, Contingent Consideration, Liability, Current		16,625	22,316
Total Current Liabilities		932,588	809,387
Deferred compensation		98,586	87,757
Deferred income taxes		123,788	329,229
Business Combination, Contingent Consideration, Liability, Noncurrent		4,076	14,494
Other non-current liabilities		133,106	138,737
Long-term Debt		2,221,824	2,221,867
TOTAL LIABILITIES		3,513,968	3,601,471
REDEEMABLE NONCONTROLLING INTERESTS		727,706	677,772
STOCKHOLDERS' EQUITY
Common stock, par value $.10; authorized 500,000,000 shares; issued 107,700,310 shares in December 2015 and 111,469,142 shares in March 2015		8,449	9,573
Additional paid-in capital		1,960,021	2,385,726
Employee stock trust		(21,860)	(24,057)
Deferred compensation employee stock trust		21,860	24,057
Retained earnings		1,911,479	1,694,859
AOCI Including Portion Attributable to Noncontrolling Interest, before Tax		(74,118)	(106,784)
TOTAL STOCKHOLDERS' EQUITY		3,833,492	4,011,172
Stockholders' Equity Attributable to Parent		3,805,831	3,983,374
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		8,075,166	8,290,415
Management Equity Plan [Member] | Royce [Member]
STOCKHOLDERS' EQUITY
Stockholders' Equity Attributable to Noncontrolling Interest	[2]	$ 27,661	$ 27,798

[1] Excludes $41,548 and $28,300 of seed capital as of December 31, 2017 and March 31, 2017, respectively, which is related to Legg Mason's investments in CIVs. See Note 13.

[2] (2) Related to Royce management equity plan.