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Revenues from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2018
May 31, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 750,206 $ 834,553 $ 1,320,193 $ 1,562,969
Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 638,783 735,430 1,087,875 1,384,861
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 92,783 79,068 196,510 140,651
Asia        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18,640 20,055 35,808 37,457
Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 602,527 671,219 1,049,921 1,270,728
Reportable Segments | Jefferies Group | Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 491,366 572,376 818,123 1,093,230
Reportable Segments | Jefferies Group | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 92,560 78,861 196,053 140,189
Reportable Segments | Jefferies Group | Asia        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18,601 19,982 35,745 37,309
Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 147,767 163,734 270,552 292,641
Reportable Segments | Merchant Banking | Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 147,505 163,454 270,032 292,031
Reportable Segments | Merchant Banking | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 223 207 457 462
Reportable Segments | Merchant Banking | Asia        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 39 73 63 148
Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Reportable Segments | Corporate | Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Reportable Segments | Corporate | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Reportable Segments | Corporate | Asia        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (88) (400) (280) (400)
Consolidation adjustments | Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (88) (400) (280) (400)
Consolidation adjustments | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Consolidation adjustments | Asia        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Equities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 164,273 159,960 316,142 311,590
Equities | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 164,361 160,360 316,422 311,990
Equities | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Equities | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Equities | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (88) (400) (280) (400)
Fixed Income        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,529 4,546 6,597 7,504
Fixed Income | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,529 4,546 6,597 7,504
Fixed Income | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Fixed Income | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Fixed Income | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Capital markets        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 251,533 283,315 356,647 532,149
Investment Banking - Capital markets | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 251,533 283,315 356,647 532,149
Investment Banking - Capital markets | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Capital markets | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Capital markets | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Advisory        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 178,554 216,982 359,036 408,139
Investment Banking - Advisory | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 178,554 216,982 359,036 408,139
Investment Banking - Advisory | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Advisory | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Investment Banking - Advisory | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Asset Management        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 4,550 6,016 11,219 10,946
Asset Management | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 4,550 6,016 11,219 10,946
Asset Management | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Asset Management | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Asset Management | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Manufacturing revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 90,237 114,735 165,662 213,100
Manufacturing revenues | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Manufacturing revenues | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 90,237 114,735 165,662 213,100
Manufacturing revenues | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Manufacturing revenues | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Oil and gas revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 47,652 39,905 84,017 60,235
Oil and gas revenues | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Oil and gas revenues | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 47,652 39,905 84,017 60,235
Oil and gas revenues | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Oil and gas revenues | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,878 9,094 20,873 19,306
Other revenues | Reportable Segments | Jefferies Group        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Other revenues | Reportable Segments | Merchant Banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,878 9,094 20,873 19,306
Other revenues | Reportable Segments | Corporate        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Other revenues | Consolidation adjustments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0