Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2016	Mar. 31, 2016
Common Stock, Par or Stated Value Per Share		$ 0.10	$ 0.10
Receivables:
Fixed assets, net		$ 160,831	$ 163,305
Current Liabilities
Business Combination, Contingent Consideration, Liability, Current		2,494
Business Combination, Contingent Consideration, Liability, Noncurrent		32,990
REDEEMABLE NONCONTROLLING INTERESTS		$ 696,800	$ 175,785
STOCKHOLDERS' EQUITY
Common Stock, Shares Authorized		500,000,000	500,000,000
Common Stock, Shares, Issued		98,086,205	107,011,664
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Current Assets
Cash and cash equivalents		$ 689,506	$ 1,329,126
Receivables:
Investment securities	[1]	437,015	515,335
Other current assets		79,490	55,405
Current Liabilities
Other current liabilities		83,206	138,301
Consolidated Investment Vehicles [Member]
Current Assets
Cash and cash equivalents		1,704	297
Receivables:
Investment securities		79,383	48,715
Other current assets		0	6,970
Other non-current assets		9,998	84
Current Liabilities
Other current liabilities		2,059	4,548
Consolidated Legg Mason, Inc.
Current Assets
Restricted cash		14,049	19,580
Receivables:
Investment advisory and related fees		421,371	334,922
Other receivables		45,508	74,694
Total Current Assets		1,768,026	2,385,044
Fixed assets, net		160,831	163,305
Intangible assets, net		4,028,810	3,146,485
Goodwill		1,927,452	1,479,516
Deferred income taxes		209,293	206,797
Other non-current assets		155,462	139,215
TOTAL ASSETS		8,259,872	7,520,446
Current Liabilities
Accrued compensation		464,745	430,736
Accounts Payable and Accrued Liabilities, Current		194,865	201,572
Short-term borrowings		0	40,000
Business Combination, Contingent Consideration, Liability, Current		2,494	26,396
Total Current Liabilities		747,369	841,553
Deferred compensation		87,531	65,897
Deferred income taxes		321,815	260,386
Business Combination, Contingent Consideration, Liability, Noncurrent		32,990	58,189
Other non-current liabilities		150,620	141,886
Long-term Debt		2,221,882	1,740,985
TOTAL LIABILITIES		3,562,207	3,108,896
REDEEMABLE NONCONTROLLING INTERESTS		696,800	175,785
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		9,809	10,701
Additional paid-in capital		2,462,889	2,693,113
Employee stock trust		(24,986)	(26,263)
Deferred compensation employee stock trust		24,986	26,263
Retained earnings		1,641,068	1,576,242
AOCI Including Portion Attributable to Noncontrolling Interest, before Tax		(136,280)	(66,493)
TOTAL STOCKHOLDERS' EQUITY		4,000,865	4,235,765
Stockholders' Equity Attributable to Parent		3,977,486	4,213,563
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		8,259,872	7,520,446
Management Equity Plan [Member] | Royce [Member]
STOCKHOLDERS' EQUITY
Stockholders' Equity Attributable to Noncontrolling Interest	[2]	$ 23,379	$ 22,202

[1] Excludes $31,779 and $13,641 of seed capital as of December 31, 2016, and March 31, 2016, respectively, which is related to Legg Mason's investments in CIVs. See Note 13.

[2] Related to Royce management equity plan.