Financial Statement Offsetting (Summary Of Offsetting Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financial Statement Offsetting [Abstract]
Derivative contracts, Gross Amounts	$ 2,514,682
Derivative contracts, Netting in Consolidated Statement of Financial Condition	(2,253,589)	[1]
Derivative contracts, Net Amounts in Consolidated Statement of Financial Condition	261,093
Derivative contracts, Net Amount	261,093
Securities borrowing arrangements, Gross Amounts	5,359,846
Securities borrowing arrangements, Net Amounts in Consolidated Statement of Financial Condition	5,359,846
Securities borrowing arrangements, Additional Amounts Available for Setoff	(530,293)	[2]
Securities borrowing arrangements, Available Collateral	(957,140)	[3]
Securities borrowing arrangements, Net Amount	3,872,413
Reverse repurchase agreements, Gross Amounts	12,715,449
Reverse repurchase agreements, Netting in Consolidated Statement of Financial Condition	(8,968,529)	[1]
Reverse repurchase agreements, Net Amounts in Consolidated Statement of Financial Condition	3,746,920
Reverse repurchase agreements, Additional Amounts Available for Setoff	(590,754)	[2]
Reverse repurchase agreements, Available Collateral	(3,074,540)	[3]
Reverse repurchase agreements, Net Amount	81,626
Derivative contracts, Gross Amounts	2,532,690
Derivative contracts, Netting in Consolidated Statement of Financial Condition	(2,352,611)	[1]
Derivative contracts, Net Amounts in Consolidated Statement of Financial Condition	180,079
Derivative contracts, Net Amount	180,079
Securities lending arrangements, Gross Amounts	2,506,122
Securities lending arrangements, Net Amounts in Consolidated Statement of Financial Condition	2,506,122
Securities lending arrangements, Additional Amounts Available for Setoff	(530,293)	[2]
Securities lending arrangements, Available Collateral	(1,942,271)	[3]
Securities lending arrangements, Net Amount	33,558
Repurchase agreements, Gross Amounts	19,748,374
Repurchase agreements, Netting in Consolidated Statement of Financial Condition	(8,968,529)	[1]
Repurchase agreements, Net Amounts in Consolidated Statement of Financial Condition	10,779,845		391,705
Repurchase agreements, Additional Amounts Available for Setoff	(590,754)	[2]
Repurchase agreements, Available Collateral	(8,748,641)	[3]
Repurchase agreements, Net Amount	$ 1,440,450

[1] Netting is applied by counterparty when a legal right of offset exists under an enforceable master netting agreement, as permitted under GAAP. Further, for derivative assets and liabilities, netting is inclusive of cash paid or received as collateral under credit support agreements pursuant to the master netting agreement.

[2] Under enforceable master netting agreements with our counterparties, Jefferies has the legal right of offset with a counterparty, which incorporates all of the counterparty's outstanding rights and obligations under the arrangement. These balances reflect additional credit risk mitigation that is available by counterparty in the event of a counterparty's default, but which are not netted in the balance sheet under the provisions of GAAP.

[3] Includes securities received or paid under collateral arrangements with counterparties that could be liquidated in the event of a counterparty default and thus offset against a counterparty's rights and obligations under the respective derivative contracts, resale and repurchase agreements or securities borrowing or lending arrangements.