VIE Consolidated Balance Sheet Detail (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014
Variable Interest Entity
Redeemable Noncontrolling Interest	$ 48,011	$ 38,498
Balance Before Consolidation of CIVs
Variable Interest Entity
Current Assets	1,627,089	1,880,689
Non-current Assets	5,153,908	5,151,942
Total Assets	6,780,997	7,032,631
Current Liabilities	510,785	808,640
Non-current Liabilities	1,737,121	1,728,510
Total Liabilities	2,247,906	2,537,150
Redeemable Noncontrolling Interest	11,092	10,787
Total Stockholders' Equity	4,521,999	4,484,694
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	6,780,997	7,032,631
CIVs
Variable Interest Entity
Current Assets	64,019	56,929
Non-current Assets	0	0
Total Assets	64,019	56,929
Current Liabilities	3,795	6,436
Non-current Liabilities	0	0
Total Liabilities	3,795	6,436
Redeemable Noncontrolling Interest	37,570	27,581
Total Stockholders' Equity	22,654	22,912
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	64,019	56,929
Eliminations
Variable Interest Entity
Current Assets	(15,628)	(15,583)
Non-current Assets	0	0
Total Assets	(15,628)	(15,583)
Current Liabilities	(32)	(30)
Non-current Liabilities	0	0
Total Liabilities	(32)	(30)
Redeemable Noncontrolling Interest	6,851	7,152
Total Stockholders' Equity	(22,447)	(22,705)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	(15,628)	(15,583)
Consolidated Legg Mason, Inc.
Variable Interest Entity
Current Assets	1,675,480	1,922,035
Non-current Assets	5,153,908	5,151,942
Total Assets	6,829,388	7,073,977
Current Liabilities	514,548	815,046
Non-current Liabilities	1,737,121	1,728,510
Total Liabilities	2,251,669	2,543,556
Redeemable Noncontrolling Interest	55,513	45,520	$ 46,970	$ 45,144
Total Stockholders' Equity	4,522,206	4,484,901
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 6,829,388	$ 7,073,977