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Acquisitions Purchase Price Allocations Summary (Details)
£ in Thousands, AUD in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2013
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
AUD
Mar. 31, 2015
USD ($)
Mar. 31, 2015
GBP (£)
May 02, 2016
USD ($)
Apr. 13, 2016
USD ($)
Oct. 21, 2015
USD ($)
Oct. 01, 2014
USD ($)
May 30, 2014
USD ($)
Business Acquisition [Line Items]                          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value       $ 508,817 $ 62,722                
RARE Infrastructure, Ltd [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross         213,739 AUD 296,000              
Business Combination, Contingent Consideration, Liability       17,444 27,145   $ 0       $ 25,000    
Business Combination, Consideration Transferred         238,739                
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                     62,722    
Business Combination, Total Entity Value                     301,461    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                     9,667    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities                     0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                     6,612    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles                     67,877    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                     673    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other                     (10,605)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other                     (3,948)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                     0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                     (58,619)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                     139,178    
Goodwill                     162,283    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (9,701)                  
Martin Currie [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross             202,577 £ 125,000          
Business Combination, Contingent Consideration, Liability       12,018 41,222   70,114         $ 75,211  
Business Combination, Consideration Transferred             277,788            
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                       0  
Business Combination, Total Entity Value                       277,788  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                       29,389  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities                       0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                       0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles                       15,234  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                       784  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other                       0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other                       (4,388)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                       (32,433)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                       (31,537)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                       119,500  
Goodwill                       158,288  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (29,204)                  
QS Investors [Domain]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross   $ 11,000                      
Business Combination, Contingent Consideration, Liability       4,841 13,749   13,553           $ 13,370
Business Combination, Consideration Transferred   $ 24,370                      
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                         0
Business Combination, Total Entity Value                         24,370
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                         441
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities                         3,281
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                         2,699
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles                         7,060
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                         599
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other                         0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other                         (6,620)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                         0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                         0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                         7,460
Goodwill                         16,910
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (8,908)                  
Fauchier [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross     $ 63,433                    
Business Combination, Contingent Consideration, Liability       0 0   27,117            
EnTrust Capital [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross [1] $ 400,000                        
Business Combination, Contingent Consideration, Liability [1]                 $ 0        
Business Combination, Consideration Transferred [1] 540,000                        
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1],[2]                 247,700        
Business Combination, Total Entity Value [1]                 787,700        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents [1]                 8,236        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities [1]                 16,220        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables [1]                 20,820        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles [1]                 65,500        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [1]                 4,479        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other [1]                 1,030        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other [1]                 (8,823)        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [1]                 0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent [1]                 0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [1]                 377,162        
Goodwill [1]                 410,538        
Clarion Partners [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Gross [1] 631,476                        
Business Combination, Contingent Consideration, Liability [1]                   $ 0      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 11,121                        
Business Combination, Consideration Transferred [1] $ 642,597                        
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1]                   105,300      
Business Combination, Total Entity Value [1]                   747,897      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents [1]                   25,307      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities [1]                   22,285      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables [1]                   53,657      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles [1]                   102,800      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [1]                   8,255      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other [1]                   (25,585)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other [1]                   (10,579)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [1]                   0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent [1]                   (36,788)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [1]                   667,652      
Goodwill [1]                   80,245      
Permal [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1],[2]                 140,000        
Trade Names | RARE Infrastructure, Ltd [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                     4,766    
Trade Names | Martin Currie [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                       7,130  
Trade Names | QS Investors [Domain]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                         0
Trade Names | EnTrust Capital [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                 7,400        
Trade Names | Clarion Partners [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                   23,100      
Other Fund Management Contracts [Member] | RARE Infrastructure, Ltd [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                     $ 122,755    
Other Fund Management Contracts [Member] | Martin Currie [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                       $ 135,321  
Other Fund Management Contracts [Member] | QS Investors [Domain]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                         $ 0
Other Fund Management Contracts [Member] | EnTrust Capital [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                 262,300        
Other Fund Management Contracts [Member] | Clarion Partners [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                   $ 505,200      
EnTrustPermal [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                 $ 403,200        
Consolidated Legg Mason, Inc.                          
Business Acquisition [Line Items]                          
Business Combination, Contingent Consideration, Liability       36,810 84,585   110,784            
Goodwill       1,924,889 1,479,516                
Consolidated Legg Mason, Inc. | Retained Earnings [Member] | EnTrust Capital [Member]                          
Business Acquisition [Line Items]                          
Reclassification from Retained Earnings to Noncontrolling Interests       (15,500) 0   0            
Consolidated Legg Mason, Inc. | Additional Paid-in Capital                          
Business Acquisition [Line Items]                          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures       71,494 65,373   54,935            
Consolidated Legg Mason, Inc. | Additional Paid-in Capital | Clarion Partners [Member]                          
Business Acquisition [Line Items]                          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures       $ 11,121 $ 0   $ 0            
[1] Subject to measurement period adjustments, including for amounts ultimately realized
[2] Post combination EnTrustPermal noncontrolling interest of $403,200 also includes a fair value reclassification of $15,500 from retained earnings.