Fair Values of Assets and Liabilities by Level (Details 1) - USD ($) $ in Thousands		Mar. 31, 2017		Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proprietary Fund Products Equity Securities		79.00%		68.00%
Proprietary Fund Products Debt Securities		21.00%		32.00%
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	[1]	$ 403,585		$ 1,057,916
Time Deposits, at Carrying Value	[1]	35,835		35,265
Cash and Cash Equivalents, Fair Value Disclosure	[1]	439,420		1,093,181
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2],[3]	2,718		8,650
Other Investments	[2]	113		83
Assets, Fair Value Disclosure		948,185		1,662,554
Short-term Investments	[4]	423,619		515,335
Business Combination, Contingent Consideration, Liability	[5]	(36,810)		(84,585)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		(4,522)	[2]	(18,079)	[3]
Liabilities, Fair Value Disclosure, Recurring		(41,332)		(102,664)
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	[1]	403,585		1,057,916
Time Deposits, at Carrying Value	[1]	0		0
Cash and Cash Equivalents, Fair Value Disclosure	[1]	403,585		1,057,916
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2],[3]	2,718		1,051
Other Investments	[2]	0		0
Assets, Fair Value Disclosure		737,081		1,436,584
Short-term Investments	[4]	330,778		377,617
Business Combination, Contingent Consideration, Liability	[5]	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		(4,522)	[2]	(18,079)	[3]
Liabilities, Fair Value Disclosure, Recurring		(4,522)		(18,079)
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	[1]	0		0
Time Deposits, at Carrying Value	[1]	35,835		35,265
Cash and Cash Equivalents, Fair Value Disclosure	[1]	35,835		35,265
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2],[3]	0		7,599
Other Investments	[2]	0		0
Assets, Fair Value Disclosure		116,435		154,791
Short-term Investments	[4]	80,501		111,927
Business Combination, Contingent Consideration, Liability	[5]	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0	[2]	0	[3]
Liabilities, Fair Value Disclosure, Recurring		0		0
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	[1]	0		0
Time Deposits, at Carrying Value	[1]	0		0
Cash and Cash Equivalents, Fair Value Disclosure	[1]	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2],[3]	0		0
Other Investments	[2]	113		83
Assets, Fair Value Disclosure		41,897		13,021
Short-term Investments	[4]	1,337		3
Business Combination, Contingent Consideration, Liability	[5]	(36,810)		(84,585)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0	[2]	0	[3]
Liabilities, Fair Value Disclosure, Recurring		(36,810)		(84,585)
Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		49,901		48,715
Assets, Fair Value Disclosure		58,725
Short-term Investments		49,901		48,715
Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		33,991		22,327
Assets, Fair Value Disclosure		33,991
Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		8,244
Assets, Fair Value Disclosure		0
Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Assets, Fair Value Disclosure		0
Hedge Funds | Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		15,910		18,144
Investments		8,824
Hedge Funds | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Investments		0
Hedge Funds | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Investments		0
Hedge Funds | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Investments		0
Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6]	220,673		325,936
Equity Method Investments, Fair Value Disclosure	[7]	2,502		8,904
Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6]	141,025		205,608
Equity Method Investments, Fair Value Disclosure	[7]	0		1,329
Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6]	75,275		102,021
Equity Method Investments, Fair Value Disclosure	[7]	2,502		7,575
Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6]	0		3
Equity Method Investments, Fair Value Disclosure	[7]	0		0
Proprietary Funds [Member] | Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		33,991		30,571
Assets, Fair Value Disclosure		28,300		13,641
Proprietary Funds [Member] | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		33,991		22,327
Proprietary Funds [Member] | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		8,244
Proprietary Funds [Member] | Consolidated Investment Vehicles [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6],[8]	41,912		67,464
Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6],[8]	39,177		65,112
Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6],[8]	2,724		2,331
Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6],[8]	0		0
Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[9]	150,903		106,564
Equity Method Investments, Fair Value Disclosure	[7]	7,629		6,467
Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[9]	150,576		105,568
Equity Method Investments, Fair Value Disclosure	[7]	0		0
Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[9]	0		0
Equity Method Investments, Fair Value Disclosure	[7]	0		0
Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[9]	0		0
Equity Method Investments, Fair Value Disclosure	[7]	1,337		0
Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[4],[7]	17,263
Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[4],[7]	0
Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[4],[7]	0
Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[4],[7]	1,646
Other Noncurrent Assets [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	23,464	[4]	20,439
Cost Method Investments, Fair Value Disclosure	[2]	3,440
Other Noncurrent Assets [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	0	[4]	0
Cost Method Investments, Fair Value Disclosure	[2]	0
Other Noncurrent Assets [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	0	[4]	0
Cost Method Investments, Fair Value Disclosure	[2]	0
Other Noncurrent Assets [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	752	[4]	627
Cost Method Investments, Fair Value Disclosure	[2]	0
Other Noncurrent Assets [Member] | Real Estate Investment [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	26,909
Other Noncurrent Assets [Member] | Real Estate Investment [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	0
Other Noncurrent Assets [Member] | Real Estate Investment [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	0
Other Noncurrent Assets [Member] | Real Estate Investment [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	26,909
Other Noncurrent Assets [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	1,924		7,931
Other Noncurrent Assets [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	0		0
Other Noncurrent Assets [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	99		0
Other Noncurrent Assets [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	1,825		4,807
Other Noncurrent Assets [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	9,315		7,501
Other Noncurrent Assets [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	0		0
Other Noncurrent Assets [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	0		0
Other Noncurrent Assets [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	9,315		7,501
Other Noncurrent Assets [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]			9,434
Other Noncurrent Assets [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]			0
Other Noncurrent Assets [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]			0
Other Noncurrent Assets [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]			0
Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		26,854		54,392
Estimate of Fair Value Measurement [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	[1]	0		0
Time Deposits, at Carrying Value	[1]	0		0
Cash and Cash Equivalents, Fair Value Disclosure	[1]	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2],[3]	0		0
Other Investments	[2]	0		0
Assets, Fair Value Disclosure		52,772		58,158
Short-term Investments	[4]	11,003		25,788
Business Combination, Contingent Consideration, Liability	[5]	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0	[2]	0	[3]
Liabilities, Fair Value Disclosure, Recurring		0		0
Estimate of Fair Value Measurement [Member] | Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		15,910		18,144
Assets, Fair Value Disclosure		24,734
Estimate of Fair Value Measurement [Member] | Hedge Funds | Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		15,910		18,144
Investments		8,824
Estimate of Fair Value Measurement [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6]	4,373		18,304
Equity Method Investments, Fair Value Disclosure	[7]	0		0
Estimate of Fair Value Measurement [Member] | Proprietary Funds [Member] | Consolidated Investment Vehicles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0		0
Estimate of Fair Value Measurement [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[6],[8]	11		21
Estimate of Fair Value Measurement [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[9]	327		996
Equity Method Investments, Fair Value Disclosure	[7]	6,292		6,467
Estimate of Fair Value Measurement [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[4],[7]	15,617
Estimate of Fair Value Measurement [Member] | Other Noncurrent Assets [Member] | Proprietary Funds [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	22,712	[4]	19,812
Cost Method Investments, Fair Value Disclosure	[2]	3,440
Estimate of Fair Value Measurement [Member] | Other Noncurrent Assets [Member] | Real Estate Investment [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]	0
Estimate of Fair Value Measurement [Member] | Other Noncurrent Assets [Member] | Other Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	0		3,124
Estimate of Fair Value Measurement [Member] | Other Noncurrent Assets [Member] | Long Term Incentive Compensation Plans [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost Method Investments, Fair Value Disclosure	[2]	$ 0		0
Estimate of Fair Value Measurement [Member] | Other Noncurrent Assets [Member] | Other Long-term Investments [Member] | Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments, Fair Value Disclosure	[2],[7]			$ 9,434

[1] Cash equivalents include highly liquid investments with original maturities of 90 days or less. Cash investments in actively traded money market funds are classified as Level 1. Cash investments in time deposits and other are measured at amortized cost, which approximates fair value because of the short time between purchase of the instrument and its expected realization, and are classified as Level 2.

[2] Amounts are included in Other non-current assets in the Consolidated Balance Sheets for each of the periods presented.

[3] See Note 15.

[4] Excludes $28,300 and $13,641 of seed capital as of March 31, 2017, and 2016, respectively, which is related to Legg Mason's investments in CIVs. See Note 17.

[5] See Note 2 and Note 8.

[6] Trading investments of proprietary fund products and other trading investments consist of approximately 79% and 21% equity and debt securities, respectively, as of March 31, 2017, and approximately 68% and 32% equity and debt securities, respectively, as of March 31, 2016.

[7] Legg Mason's equity method investments are investment companies that record underlying investments at fair value. Therefore, the fair value of these investments is measured using Legg Mason's share of the investee's underlying net income or loss, which is predominately representative of fair value adjustments in the investments held by the equity method investee.

[8] Includes $26,854 and $54,392 in noncontrolling interests associated with consolidated seed investment products as of March 31, 2017 and 2016, respectively.

[9] Primarily mutual funds where there is minimal market risk to the Company as any change in value is primarily offset by an adjustment to compensation expense and related deferred compensation liability.