Derivatives and Hedging (Tables)
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12 Months Ended |
Mar. 31, 2019 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
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Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
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Schedule of Derivative Assets at Fair Value [Table Text Block] |
The following table presents the derivative assets and related offsets, if any: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Gross Amounts Not Offset in the Balance Sheet | | | | | Gross Amounts of Recognized Assets | | Gross Amounts Offset in the Balance Sheet | | Net Amount of Derivative Assets Presented in the Balance Sheet | | Financial Instruments | | Cash Collateral | | Net amount as of March 31, 2018 | | | | | | | | | | | | | | Derivative instruments not designated as hedging instruments | | | | | | | Currency forward contracts | | $ | 7,997 |
| | $ | (3,177 | ) | | $ | 4,820 |
| | $ | — |
| | $ | — |
| | $ | 4,820 |
| Total return swaps | | — |
| | — |
| | — |
| | 84 |
| | 1,283 |
| | 1,367 |
| Total derivative instruments not designated as hedging instruments | | $ | 7,997 |
| | $ | (3,177 | ) | | $ | 4,820 |
| | $ | 84 |
| | $ | 1,283 |
| | $ | 6,187 |
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The following table presents the derivative assets and related offsets, if any: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Gross Amounts Not Offset in the Balance Sheet | | | | | Gross Amounts of Recognized Assets | | Gross Amounts Offset in the Balance Sheet | | Net Amount of Derivative Assets Presented in the Balance Sheet | | Financial Instruments | | Cash Collateral | | Net Amount as of March 31, 2019 | | | | | | | | | | | | | | Derivative instruments not designated as hedging instruments | | | | | | | Currency forward contracts | | $ | 3,997 |
| | $ | (1,874 | ) | | $ | 2,123 |
| | $ | — |
| | $ | — |
| | $ | 2,123 |
| Total return swaps | | — |
| | — |
| | — |
| | 2,060 |
| | 2,310 |
| | 4,370 |
| Total derivative instruments not designated as hedging instruments | | $ | 3,997 |
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| $ | (1,874 | ) |
| $ | 2,123 |
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| $ | 2,060 |
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| $ | 2,310 |
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| $ | 6,493 |
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Schedule of Derivative Liabilities at Fair Value [Table Text Block] |
The following table presents the derivative liabilities and related offsets, if any: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Gross Amounts Not Offset in the Balance Sheet | | | | | Gross Amounts of Recognized Liabilities | | Gross Amounts Offset in the Balance Sheet | | Net Amount of Derivative Liabilities Presented in the Balance Sheet | | Financial Instruments | | Cash Collateral | | Net Amount as of March 31, 2019 | | | | | | | | | | | | | | Derivative instruments not designated as hedging instruments | | | | | | | Currency forward contracts | | $ | (7,465 | ) | | $ | 2,094 |
| | $ | (5,371 | ) | | $ | — |
| | $ | — |
| | $ | (5,371 | ) | Futures contracts relating to: | | | | | | | | | | | Seed capital investments | | — |
| | — |
| | — |
| | (1,798 | ) | | 7,640 |
| | 5,842 |
| Total return swaps | | — |
| | — |
| | — |
| | (410 | ) | | 1,104 |
| | 694 |
| Total future contracts | | — |
| | — |
| | — |
| — |
| (2,208 | ) |
| 8,744 |
| | 6,536 |
| Total derivative instruments not designated as hedging instruments | | $ | (7,465 | ) | | $ | 2,094 |
| | $ | (5,371 | ) | | $ | (2,208 | ) | | $ | 8,744 |
| | $ | 1,165 |
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The following table presents the derivative liabilities and related offsets, if any: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Gross Amounts Not Offset in the Balance Sheet | | | | | Gross Amounts of Recognized Liabilities | | Gross Amounts Offset in the Balance Sheet | | Net Amount of Derivative Liabilities Presented in the Balance Sheet | | Financial Instruments | | Cash Collateral | | Net amount as of March 31, 2018 | | | | | | | | | | | | | | Derivative instruments not designated as hedging instruments | | | | | | | Currency forward contracts | | $ | (532 | ) | | $ | 223 |
| | $ | (309 | ) | | $ | — |
| | $ | — |
| | $ | (309 | ) | Futures contracts relating to: | | | | | | | | | | | | | Seed capital investments | | — |
| | — |
| | — |
| | (2,875 | ) | | 9,214 |
| | 6,339 |
| Total return swaps | | — |
| | — |
| | — |
| | (1,029 | ) | | 3,201 |
| | 2,172 |
| Total futures contracts | | — |
| | — |
| | — |
| | (3,904 | ) | | 12,415 |
| | 8,511 |
| Total return swaps | | — |
| | — |
| | — |
| | (2,233 | ) | | 5,637 |
| | 3,404 |
| Total derivative instruments not designated as hedging instruments | | $ | (532 | ) | | $ | 223 |
| | $ | (309 | ) | | $ | (6,137 | ) | | $ | 18,052 |
| | $ | 11,606 |
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Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance |
The following table presents gains (losses) recognized in the Consolidated Statements of Income (Loss) on derivative instruments. As described above, the currency forward contracts and futures and forward contracts for seed capital investments included below are economic hedges of interest rate and market risk of certain operating and investing activities of Legg Mason. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Years Ended March 31, | | | | | 2019 | | 2018 | | 2017 | | | Income Statement Classification | | Gains | | Losses | | Gains | | Losses | | Gains | | Losses | Derivatives not designated as hedging instruments | | | | | | | | | | | Currency forward contracts relating to: | | | | | | | | | | | | | Operating activities | | Other expense | | $ | 8,881 |
| | $ | (17,270 | ) | | $ | 13,880 |
| | $ | (6,774 | ) | | $ | 14,524 |
| | $ | (13,098 | ) | Seed capital investments | | Other non-operating income (expense) | | 4,904 |
| | (930 | ) | | 494 |
| | (2,459 | ) | | 2,681 |
| | (2,443 | ) | Futures contracts relating to: | | | | | | | | | | | | | Seed capital investments | | Other non-operating income (expense) | | 17,648 |
| | (18,416 | ) | | 222 |
| | (24,025 | ) | | 2,103 |
| | (18,602 | ) | Total return swaps | | Other non-operating income (expense) | | 3,116 |
| | (5,615 | ) | | 90 |
| | (8,721 | ) | | — |
| | — |
| Total return swaps | | Other non-operating income (expense) | | 4,316 |
| | — |
| | 2,247 |
| | (1,142 | ) | | — |
| | — |
| Total gain (loss) from derivatives not designated as hedging instruments | | 38,865 |
| | (42,231 | ) | | 16,933 |
| | (43,121 | ) |
| 19,308 |
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| (34,143 | ) | Derivative designated as a cash flow hedge (see Note 6) | | | | | | | | | | | Interest rate swap (termination) | | Other non-operating income (expense) | | — |
| | — |
| | — |
| | — |
| | — |
| | (3,662 | ) | Interest rate swap | | Interest expense | | — |
| | — |
| | — |
| | — |
| | — |
| | (764 | ) | Total | | | | $ | 38,865 |
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| $ | (42,231 | ) |
| $ | 16,933 |
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| $ | (43,121 | ) |
| $ | 19,308 |
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| $ | (38,569 | ) |
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