Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2011

Intangible Assets And Goodwill Disclosure [Abstract]

Components of intangible assets

	September 30, 2011			March 31, 2011
Amortizable asset management contracts
Cost	$	206,353		$	208,454
Accumulated amortization	(164,156		)	(155,136		)
Net	42,197			53,318
Indefinite–life intangible assets
Fund management contracts	3,753,480			3,753,657
Trade names	69,800			69,800
	3,823,280			3,823,457
Intangible assets, net	$	3,865,477		$	3,876,775

Estimated amortization expense

Remaining 2012	$	8,463
2013	14,085
2014	11,902
2015	2,987
2016	2,731
Thereafter	2,029
Total	$	42,197

Changes in carrying value of goodwill

The change in the carrying value of goodwill for the six months ended September 30, 2011, is summarized below:

	Gross Book Value			Accumulated Impairment			Net Book Value
Balance as of March 31, 2011	$	2,473,552		$	(1,161,900	)	$	1,311,652
Impact of excess tax basis amortization	(10,605		)	—			(10,605		)
Other, including changes in foreign exchange rates	(18,999		)	—			(18,999		)
Balance as of September 30, 2011	$	2,443,948		$	(1,161,900	)	$	1,282,048