1.0.0.3 false CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 4 Net Income (Loss) 2 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 52324000 52324 false false 2 true true -36081000 -36081 false false No definition available. No authoritative reference available. false 5 Other comprehensive income gains (losses): 2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 6 Foreign currency translation adjustment 3 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 41335000 41335 false false 2 false true 12538000 12538 false false No definition available. No authoritative reference available. false 7 Unrealized holding losses on investment securities, net of tax benefit of $16 and $31, respectively 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -24000 -24 false false 2 false true -46000 -46 false false No definition available. No authoritative reference available. false 8 Unrealized and realized gains on cash flow hedge, net of tax provision of $0 and $368, respectively 3 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 459000 459 false false No definition available. No authoritative reference available. false 9 Total other comprehensive income 3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 41311000 41311 false false 2 false true 12951000 12951 false false No definition available. No authoritative reference available. true 10 Comprehensive Income (Loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 93635000 93635 false false 2 false true -23130000 -23130 false false No definition available. No authoritative reference available. true 11 Less: Comprehensive income attributable to noncontrolling interests 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2270000 2270 false false 2 false true 46000 46 false false No definition available. No authoritative reference available. false 12 Comprehensive Income (Loss) attributable to Legg Mason, Inc. 2 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 91365000 91365 false false 2 true true -23176000 -23176 false false No definition available. No authoritative reference available. true false 2 9 false Thousands UnKnown UnKnown false true