Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Rent Expense [Table Text Block]

	2017		2016		2015
Rental expense	$	139,781	$	135,850	$	136,414
Less: Sublease income	21,010		21,154		19,672
Net rent expense	$	118,771	$	114,696	$	116,742

Schedule Of Future Minimum Rental Payments For Operating Leases

2018	$	128,445
2019	105,864
2020	93,154
2021	84,339
2022	83,302
Thereafter	182,872
Total(1)	$	677,976

Lease Liability Reserve Roll Forward [Table Text Block]

Balance as of March 31, 2015	$	45,939
Accrued charges for vacated and subleased space (1) (2)	14,642
Payments, net	(12,689		)
Adjustments and other	4,348
Balance as of March 31, 2016	52,240
Accrued charges for vacated and subleased space (1) (2)	9,454
Payments, net	(16,531		)
Adjustments and other	(5,475		)
Balance as of March 31, 2017	$	39,688

(1) Included in Occupancy expense in the Consolidated Statements of Income (Loss)

(2) Includes $9,069 and $7,212related to the restructuring of Permal for the combination with EnTrust for the years ended March 31, 2017 and 2016, respectively. See Note 2 for additional information.

Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

	RARE Infrastructure			Martin Currie			QS Investors			Fauchier			Other(2)			Total
Acquisition Date	October 21, 2015			October 1, 2014			May 30, 2014			March 13, 2013			Various
Maximum Remaining Contingent Consideration(1)	$	81,063		$	407,403		$	23,400		$	—		$	5,507		$	517,373
Contingent Consideration Liability
Balance as of March 31, 2015	$	—		$	70,114		$	13,553		$	27,117		$	—		$	110,784
Initial purchase accounting accrual(3)	25,000			—			—			—			2,457			27,457
Payment	—			—			—			(22,765		)	—			(22,765		)
Fair value adjustments	—			(28,361		)	—			(5,014		)	—			(33,375		)
Foreign exchange and accretion	2,145			(531		)	196			662			12			2,484
Balance as of March 31, 2016	27,145			41,222			13,749			—			2,469			84,585
Initial purchase accounting accrual	—			—			—			—			2,000			2,000
Payment	—			—			(6,587		)	—			—			(6,587		)
Fair value adjustments	(10,000		)	(25,000		)	(2,500		)	—			(2,000		)	(39,500		)
Foreign exchange and accretion	299			(4,204		)	179			—			38			(3,688		)
Balance as of March 31, 2017	$	17,444		$	12,018		$	4,841		$	—		$	2,507		$	36,810
Balance Sheet Classification
Current Contingent consideration	$	7,791		$	12,018		$	—		$	—		$	2,507		$	22,316
Non-current Contingent consideration	9,653			—			4,841			—			—			14,494
Balance as of March 31, 2017	$	17,444		$	12,018		$	4,841		$	—		$	2,507		$	36,810

(1) Using the applicable exchange rate as of March 31, 2017, for amounts denominated in currencies other than the U.S. dollar.

(2) Includes amounts related to the acquisition of Financial Guard on August 17, 2016 and PK Investments on December 31, 2015.

(3) Using the applicable exchange rate on the date of acquisition for amounts denominated in currencies other than the U.S. dollar.