Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Components of intangible assets

	September 30, 2017			March 31, 2017
Amortizable intangible asset management contracts and other
Cost	$	375,976		$	408,025
Accumulated amortization	(206,027		)	(194,371		)
Net	169,949			213,654
Indefinite–life intangible assets
U.S. domestic mutual fund management contracts	2,106,351			2,106,351
Clarion Partners fund management contracts	505,200			505,200
EnTrustPermal fund management contracts	596,404			596,404
Other fund management contracts	554,338			542,908
Trade names	68,269			69,863
	3,830,562			3,820,726
Intangible assets, net	$	4,000,511		$	4,034,380

Estimated amortization expense

Remaining fiscal 2018	$	12,378
2019	24,756
2020	23,979
2021	23,875
2022	23,638
Thereafter	61,323
Total	$	169,949

Changes in carrying value of goodwill

	Gross Book Value			Accumulated Impairment			Net Book Value
Balance as of March 31, 2017	$	3,086,789		$	(1,161,900	)	$	1,924,889
Impact of excess tax basis amortization	(10,407		)	—			(10,407		)
Changes in foreign exchange rates and other	16,869			—			16,869
Balance as of September 30, 2017	$	3,093,251		$	(1,161,900	)	$	1,931,351