The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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Fixed Assets (Details) (Consolidated Legg Mason Group [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Fixed assets:
Total cost	$ 607,179		$ 607,179		$ 704,999
Less: accumulated depreciation and amortization	(360,848)		(360,848)		(418,294)
Fixed assets, net	246,331		246,331		286,705
Depreciation and amortization expense included in operating income	25,246	19,785	59,209	60,722
Equipment
Fixed assets:
Total cost	157,489		157,489		200,696
Software
Fixed assets:
Total cost	206,007		206,007		224,026
Leasehold improvements
Fixed assets:
Total cost	$ 243,683		$ 243,683		$ 280,277