Income Taxes (Details 5) (Consolidated Legg Mason, USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Consolidated Legg Mason
Operating Loss Carryforwards
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 11,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense (substantially all interest)	5,500	1,300	3,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	14,000	10,000	9,000
Earnings from foreign subsidiaries that have been repatriated	394,000
Amount remaining of earnings from foreign subsidiaries to be repatriated	325,000
Accumulated Earnings Planned to be Repatriated, Total	$ 18,000

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References+ Details

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References+ Details