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Acquisitions Schedule of Proforma Information (Tables)
 12 Months Ended
Mar. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]
 
 
Years Ended March 31,
 
 
2017
 
2016
Revenues
 
$
2,904,253

 
$
2,977,612

Net Income (Loss) Attributable to Legg Mason, Inc.
 
272,985

 
(79,347
)
Net Income (Loss) Per Share Attributable to Legg Mason, Inc. Shareholders:
 
 
 
 
Basic
 
$
2.63

 
$
(0.74
)
Diluted
 
$
2.62

 
$
(0.74
)