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Employee Benefits	12 Months Ended
Employee Benefits	Mar. 31, 2012
Employee Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	10. EMPLOYEE BENEFITS Legg Mason, through its subsidiaries, maintains various defined contribution plans covering substantially all employees. Through its primary plan, Legg Mason can make two types of discretionary contributions. One is a profit sharing contribution to eligible Plan participants based on a percentage of qualified compensation and the other is a 50% match of employee 401(k) contributions up to 6% of employee compensation with a maximum of five thousand dollars per year. Profit sharing and matching contributions amounted to $22,336 and $22,739 in fiscal 2012 and 2011, respectively. In addition, employees can make voluntary contributions under certain plans.

The entire disclosure for pension and other postretirement benefits.

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