CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 245,763	$ 210,980	$ (1,964,994)
Loss on Equity Unit exchange		22,040
Realized loss on sale of SIV securities			2,257,217
Adjustments to reconcile Net Income to net cash provided by operations:
Depreciation and amortization	102,748	114,078	138,445
Imputed interest for 2.5% convertible senior notes	36,688	34,445	32,340
Accretion and amortization of securities discounts and premiums, net	4,539	13,387	7,177
Stock-based compensation	56,245	46,578	56,993
Net (gains) losses on investments	(58,851)	(103,457)	114,412
Net (gains) losses of consolidated investment vehicles	3,959	(17,359)	(7,615)
Unrealized (gains) losses on fund support		(22,115)	25,996
Deferred income taxes	80,272	113,947	(817,477)
Impairment of goodwill and intangible assets			1,307,970
Other	5,393	2,808	17,918
Decrease (increase) in assets excluding acquisitions:
Investment advisory and related fees receivable	(13,794)	(53,402)	227,137
Net (purchases) sales of trading and other current investments	(55,540)	52,288	(58,867)
Refundable income taxes		992,548
Other receivables	1,962	177,667	(626,392)
Other assets	(20,923)	(50,082)	492,597
Increase (decrease) in liabilities excluding acquisitions:
Accrued compensation	75,970	(89,800)	(234,817)
Deferred compensation	(44,825)	32,197	(44,838)
Accounts payable and accrued expenses	(251)	2,686	(93,214)
Other liabilities	(49,954)	(86,484)	(362,349)
Net increase in operating assets and liabilities of consolidated investment vehicles, including cash	42,739	20,213	(85,579)
CASH PROVIDED BY OPERATING ACTIVITIES	412,140	1,413,163	382,060
CASH FLOWS FROM INVESTING ACTIVITIES
Payments for fixed assets	(32,904)	(84,117)	(130,950)
Payments for business acquisitions-related costs		(11,092)	(7,524)
Contractual acquisition earnout settlements (payments)		(179,804)	120,000
Proceeds from sale of assets		150	181,147
Fund Support:
Restricted cash, net (principally collateral)		38,890	801,793
Payments under liquidity fund support arrangements			(305,933)
Proceeds from sale of SIV securities			513,855
Purchases of SIV securities, net of distributions			(2,868,815)
Net (increase) decrease in securities purchased under agreements to resell			604,642
Purchases of investment securities	(8,430)	(55,507)	(1,293)
Proceeds from sales and maturities of investment securities	9,077	14,792	2,172
Purchases of investments by consolidated investment vehicles	(173,261)
Proceeds from sales and maturities of investments by consolidated investment vehicles	161,047
CASH USED FOR INVESTING ACTIVITIES	(44,471)	(276,688)	(1,090,906)
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in short-term borrowings			(250,000)
Proceeds from issuance of long-term debt, net			1,089,463
Debt issue costs		(3,056)
Third-party distribution financing, net	(1,639)	(2,428)	(4,814)
Repayment of principal on long-term debt	(3,515)	(554,913)	(429,608)
Payment on Equity Unit exchange		(135,015)
Issuance of common stock	14,440	4,999	31,983
Repurchase of common stock	(445,465)
Dividends paid	(26,813)	(48,241)	(135,878)
Net repayment by consolidated investment vehicles	(7,025)
Net (redemptions/distributions paid)/subscriptions received from noncontrolling interest holders	1,551	(8,066)	28,004
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(468,466)	(746,720)	329,150
EFFECT OF EXCHANGE RATE CHANGES ON CASH	10,827	19,481	(27,206)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(89,970)	409,236	(406,902)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	1,465,888	1,056,652	1,463,554
CASH AND CASH EQUIVALENTS AT END OF YEAR	1,375,918	1,465,888	1,056,652
Cash paid (received) for:
Income taxes (net of payments in 2010 of $60,747)	39,524	(994,823)	156,129
Interest	$ 46,620	$ 73,909	$ 158,499