Schedule I (PARENT COMPANY ONLY) - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2017		Nov. 30, 2016		Nov. 30, 2015
Revenues:
Principal transactions										$ 800,660		$ 519,652		$ 172,608
Asset management fees and investment income from managed funds										16,463		31,062		8,015
Interest										905,601		857,838		922,189
Other										98,316		19,724		74,074
Total revenues		$ 1,081,499	$ 1,048,331	$ 1,038,955	$ 1,009,797	$ 939,960	$ 863,841	$ 936,917	$ 493,105	4,178,582		3,233,823		3,274,895
Interest expense										980,473		819,209		799,654
Net revenues		822,610	800,692	779,294	795,513	741,769	654,450	719,408	298,987	3,198,109		2,414,614		2,475,241
Non-interest expenses:
Total non-interest expenses										2,693,185		2,384,642		2,361,014
Earnings before income taxes		$ 142,280	$ 122,264	$ 116,181	$ 124,199	$ 96,529	$ 80,722	$ 102,597	$ (249,876)	504,924		29,972		114,227
Income tax expense (benefit)										147,340		14,566		18,898
Net earnings										357,584		15,406		95,329
Net earnings attributable to Jefferies Group LLC										357,498		15,434		93,534
Other comprehensive income (loss), net of tax:
Currency translation and other adjustments										53,396		(115,494)		(27,157)
Changes in instrument specific credit risk										(21,394)	[1]	(6,494)	[1]	0
Cash flow hedges										(936)	[2]	0		0
Minimum pension liability adjustments, net of tax	[3]									312		(1,223)		(3,116)
Total other comprehensive income (loss), net of tax	[4]									31,378		(123,211)		(30,273)
Comprehensive income (loss) attributable to Jefferies Group LLC										388,876		(107,777)		63,261
Parent Company
Revenues:
Principal transactions										12,410		952		68,720
Asset management fees and investment income from managed funds										(10,568)		1,222		(20,889)
Interest										241,357		226,781		201,632
Other										78,812		(8,156)		33,193
Total revenues										322,011		220,799		282,656
Interest expense										276,727		235,556		250,919
Net revenues										45,284		(14,757)		31,737
Non-interest expenses:
Total non-interest expenses										13,598		5,187		5,984
Earnings before income taxes										31,686		(19,944)		25,753
Income tax expense (benefit)										(21,292)		(9,574)		3,958
Net earnings										52,978		(10,370)		21,795
Undistributed earnings of subsidiaries										304,520		25,804		71,739
Net earnings attributable to Jefferies Group LLC										357,498		15,434		93,534
Other comprehensive income (loss), net of tax:
Currency translation and other adjustments										53,396		(115,494)		(27,157)
Changes in instrument specific credit risk										(21,394)		(6,494)		0
Cash flow hedges										(936)		0		0
Minimum pension liability adjustments, net of tax										312		(1,223)		(3,116)
Total other comprehensive income (loss), net of tax										31,378		(123,211)		(30,273)
Comprehensive income (loss) attributable to Jefferies Group LLC										$ 388,876		$ (107,777)		$ 63,261

[1] Includes income tax benefit of approximately $13.2 million and $4.3 million for the years ended November 30, 2017 and 2016, respectively.

[2] Includes income tax benefit of approximately $0.6 million for the year ended November 30, 2017.

[3] Includes income tax benefit of approximately $0.1 million, $0.3 million and $4.2 million for the years ended November 30, 2017, 2016 and 2015, respectively.

[4] None of the components of other comprehensive income (loss) are attributable to noncontrolling interests.