Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OTHER NON-OPERATING INCOME (EXPENSE)
Less: Net income attributable to noncontrolling interests	$ 391	$ 1,424
Consolidated Legg Mason, Inc.
Investment advisory fees
Separate accounts	208,104	204,770
Funds	384,345	381,627
Performance fees	18,653	16,303
Distribution and service fees	96,860	89,716
Other	688	1,465
Total Operating Revenues	708,650	693,881
OPERATING EXPENSES
Compensation and benefits	315,052	305,506
Distribution and servicing	149,288	148,708
Communications and technology	48,677	41,950
Occupancy	25,987	26,957
Amortization of intangible assets	657	895
Other	44,446	50,319
Total Operating Expenses	584,107	574,335
OPERATING INCOME	124,543	119,546
OTHER NON-OPERATING INCOME (EXPENSE)
Interest income	1,317	2,525
Interest expense	(11,949)	(17,058)
Total Other Non-Operating Income (Expense)	(4,514)	(5,278)
INCOME BEFORE INCOME TAX PROVISION	120,029	114,268
Income tax provision	25,090	40,656
NET INCOME	94,939	73,612
Less: Net income attributable to noncontrolling interests	391	1,424
NET INCOME ATTRIBUTABLE TO LEGG MASON, INC.	$ 94,548	$ 72,188
NET INCOME PER SHARE ATTRIBUTABLE TO LEGG MASON, INC. COMMON SHAREHOLDERS
Basic (in dollars per share)	$ 0.85	$ 0.62
Diluted (in dollars per share)	0.84	0.61
Common Stock, Dividends, Per Share, Declared	$ 0.20	$ 0.16
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Investment advisory fees
Total Operating Revenues	$ 708,735	$ 694,064
OPERATING EXPENSES
OPERATING INCOME	124,648	119,749
OTHER NON-OPERATING INCOME (EXPENSE)
Other income (expense), net, including debt extinguishment losses of $107,074 in July 2014 and $68,675 in May 2012	5,711	6,248
Total Other Non-Operating Income (Expense)	(4,879)	(6,816)
INCOME BEFORE INCOME TAX PROVISION	119,769	112,933
Income tax provision	25,090	40,656
NET INCOME	94,679	72,277
Less: Net income attributable to noncontrolling interests	131	89
NET INCOME ATTRIBUTABLE TO LEGG MASON, INC.	94,548	72,188
Consolidated Investment Vehicles [Member]
Investment advisory fees
Total Operating Revenues	0	0
OPERATING EXPENSES
OPERATING INCOME	(105)	(203)
OTHER NON-OPERATING INCOME (EXPENSE)
Other income (expense), net, including debt extinguishment losses of $107,074 in July 2014 and $68,675 in May 2012	407	3,007
Total Other Non-Operating Income (Expense)	407	3,007
INCOME BEFORE INCOME TAX PROVISION	302	2,804
Income tax provision	0	0
NET INCOME	302	2,804
Less: Net income attributable to noncontrolling interests	0	1,068
NET INCOME ATTRIBUTABLE TO LEGG MASON, INC.	$ 302	$ 1,736