Schedule I (PARENT COMPANY ONLY) - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Revenues:
Principal transactions		$ 1,505,618	$ 1,867,013	$ 769,258
Revenues from contracts with customers:		5,276,691	3,333,939	2,222,257
Interest		847,969	894,215	1,496,529
Other		219,762	37,632	93,422
Total revenues		7,907,287	6,152,306	4,584,532
Interest expense		863,464	954,829	1,472,002
Net revenues		7,043,823	5,197,477	3,112,530
Non-interest expenses:
Total non-interest expenses		4,859,870	4,020,023	2,787,861
Earnings before income taxes		2,183,953	1,177,454	324,669
Income tax expense (benefit)		559,229	302,748	80,284
Net earnings		1,624,724	874,706	244,385
Net earnings attributable to Jefferies Group LLC		1,618,731	879,303	246,029
Other comprehensive income (loss), net of tax:
Currency translation and other adjustments	[1]	(9,818)	37,535	6,426
Change in instrument specific credit risk	[2]	(82,521)	(52,262)	(13,161)
Cash flow hedges	[3]	0	0	(470)
Minimum pension liability adjustments, net of tax	[4]	(739)	(2,025)	(1,318)
Unrealized gain on available-for-sale securities		(244)	372	487
Total other comprehensive loss, net of tax	[5]	(93,322)	(16,380)	(8,036)
Comprehensive income attributable to Jefferies Group LLC		1,525,409	862,923	237,993
Investment banking
Revenues:
Revenues from contracts with customers:		4,366,055	2,501,494	1,528,729
Parent company
Revenues:
Principal transactions		10,347	58,148	13,746
Interest		210,410	214,833	271,369
Other		102,578	(38,874)	19,346
Total revenues		323,335	234,124	304,564
Interest expense		265,005	285,090	297,927
Net revenues		58,330	(50,966)	6,637
Non-interest expenses:
Total non-interest expenses		47,309	14,854	6,482
Earnings before income taxes		11,021	(65,820)	155
Income tax expense (benefit)		8,130	(19,480)	(3,316)
Net earnings		2,891	(46,340)	3,471
Undistributed earnings of subsidiaries		1,615,840	925,643	242,558
Net earnings attributable to Jefferies Group LLC		1,618,731	879,303	246,029
Other comprehensive income (loss), net of tax:
Currency translation and other adjustments		(9,818)	37,535	6,426
Change in instrument specific credit risk		(82,521)	(52,262)	(13,161)
Cash flow hedges		0	0	(470)
Minimum pension liability adjustments, net of tax		(739)	(2,025)	(1,318)
Unrealized gain on available-for-sale securities		(244)	372	487
Total other comprehensive loss, net of tax		(93,322)	(16,380)	(8,036)
Comprehensive income attributable to Jefferies Group LLC		1,525,409	862,923	237,993
Parent company | Investment banking
Revenues:
Revenues from contracts with customers:		$ 0	$ 17	$ 103

[1] The amounts include income tax benefits (expenses) of approximately $0.6 million, $(11.9) million and $(3.2) million during the years ended November 30, 2021, 2020 and 2019, respectively.

[2] The amounts include income tax benefits of approximately $26.7 million, $16.4 million and $4.5 million for the years ended November 30, 2021, 2020 and 2019, respectively. The amounts for the years ended November 30, 2021, 2020 and 2019 include net gains (losses) of $(1.9) million, $(0.4) million and $0.4 million, respectively, net of tax benefits (expenses) of $0.6 million, $0.1 million and $(0.2) million, respectively, related to changes in instrument specific risk, which were reclassified to Principal transactions revenues within the Consolidated Statements of Earnings.

[3] The includes income tax benefits of approximately $0.2 million for the year ended 2019. The cash flow hedge loss of $0.5 million during the year ended November 30, 2019 was reclassified to Other revenues within the Consolidated Statement of Earnings.

[4] The amounts include income tax benefits of $0.2 million, $0.7 million and $0.5 million for the years ended November 30, 2021, 2020 and 2019, respectively. The amounts during the years ended November 30, 2021 and 2020, include pension net gains of $0.4 million and $0.5 million, respectively, net of tax of $0.1 million and $0.2 million, respectively, which were reclassified to Compensation and benefits expenses within the Consolidated Statements of Earnings. The amount during the year ended November 30, 2019 includes pension net gains of $0.1 million, net of negligible tax expenses, which were reclassified to Compensation and benefits expenses within the Consolidated Statements of Earnings.

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