COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Operating leases
2012	$ 142,259,000
2013	123,992,000
2014	100,072,000
2015	89,963,000
2016	83,135,000
Thereafter	522,145,000
Total	1,061,566,000
Minimum sublease rentals to be received in the future under non-cancelable subleases	148,556,000
Sublease rentals due from one counterparty (as a percent)	55.00%
Minimum rental commitments, real estate leases and equipment leases	967,688,000
Minimum rental commitments, service and maintenance agreements	93,878,000
Rental commitments for vacated office space	13,337,000
Other related costs incurred for lease	2,587,000	19,331,000
Rental expense under all operating leases and servicing agreements
Rental expense	137,072,000	137,771,000	127,949,000
Less: sublease income	10,848,000	8,573,000	15,488,000
Net rent expense	126,224,000	129,198,000	112,461,000
Commitment to invest in investment vehicles	23,381,000	45,697,000
Liability for losses and contingencies	500,000	21,500,000
Litigation related charges	2,500,000	21,200,000	600,000
Reserve for an affiliate investor settlement		19,000,000
Reduced liability for settlement payments	$ 23,500,000	$ 1,500,000	$ 500,000