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Derivatives and Hedging Gains and (Losses) of Derivative Instruments (Details) - Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain on Derivative     $ 13,954 $ 16,767
Derivative, Loss on Derivative     (30,141) (30,447)
Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain $ 4,458 $ 5,265 13,954 16,767
Derivative Instruments Not Designated as Hedging Instruments, Loss (12,017) (10,550) (30,141) (26,021)
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain 2,005 1,368 10,980 11,148
Derivative Instruments Not Designated as Hedging Instruments, Loss (1,146) 6,199 4,917 13,085
Not Designated as Hedging Instrument [Member] | Total Return Swap [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain 1,796 0 2,562 0
Derivative Instruments Not Designated as Hedging Instruments, Loss (11) 0 0 0
Not Designated as Hedging Instrument [Member] | Proprietary Funds [Member] | Forward Contracts [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain 624 1,932 251 2,943
Derivative Instruments Not Designated as Hedging Instruments, Loss (518) 837 1,868 1,752
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain on Derivative       0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain on Derivative     0 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Loss on Derivative       (3,662)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Loss on Derivative     0 (764)
Investments [Member] | Not Designated as Hedging Instrument [Member] | Future [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain 33 1,965 72 2,676
Derivative Instruments Not Designated as Hedging Instruments, Loss (6,864) (3,514) (18,082) 11,184
Derivative Financial Instruments, Assets [Member] | Not Designated as Hedging Instrument [Member] | Future [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain 0 0 89 0
Derivative Instruments Not Designated as Hedging Instruments, Loss $ 3,478 $ 0 $ 5,274 $ 0