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Acquisitions Schedule of Proforma Information (Tables)
 6 Months Ended
Sep. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]
 
 
Three Months Ended September 30, 2016
 
Six Months Ended September 30, 2016
Revenues
 
$
748,370

 
$
1,465,886

Net Income Attributable to Legg Mason, Inc.
 
75,336

 
143,587

Net Income Per Share Attributable to Legg Mason, Inc. Shareholders:
 
 
 
 
Basic
 
$
0.72

 
$
1.35

Diluted
 
0.71

 
1.35