Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2013	Nov. 30, 2013	Nov. 30, 2015	Nov. 30, 2014
Non-compensation expenses:
Goodwill impairment			$ 0	$ 54,000
Successor [Member]
Revenues:
Commissions and other fees		$ 472,596	659,002	668,801
Principal transactions		399,091	172,608	532,292
Investment banking		1,003,517	1,439,007	1,529,274
Asset management fees and investment income from managed funds		36,093	8,015	17,047
Interest		714,248	922,189	1,019,970
Other		94,195	74,074	78,881
Total revenues		2,719,740	3,274,895	3,846,265
Interest expense		579,059	799,654	856,127
Net revenues		2,140,681	2,475,241	2,990,138
Interest on mandatorily redeemable preferred interests of consolidated subsidiaries		3,368	0	0
Net revenues, less interest on mandatorily redeemable preferred interests of consolidated subsidiaries		2,137,313	2,475,241	2,990,138
Non-interest expenses:
Compensation and benefits		1,213,908	1,467,131	1,698,530
Non-compensation expenses:
Floor brokerage and clearing fees		150,774	199,780	215,329
Technology and communications		193,683	313,044	268,212
Occupancy and equipment rental		86,701	101,138	107,767
Business development		63,115	105,963	106,984
Professional services		72,802	103,972	109,601
Bad debt provision		179	(396)	55,355
Goodwill impairment		0	0	54,000
Other		91,856	70,382	71,339
Total non-compensation expenses		659,110	893,883	988,587
Total non-interest expenses		1,873,018	2,361,014	2,687,117
Earnings before income taxes		264,295	114,227	303,021
Income tax expense		94,686	18,898	142,061
Net earnings		169,609	95,329	160,960
Net earnings attributable to noncontrolling interests		8,418	1,795	3,400
Net earnings attributable to Jefferies Group LLC/ common stockholders		$ 161,191	$ 93,534	$ 157,560
Predecessor [Member]
Revenues:
Commissions and other fees	$ 146,240
Principal transactions	300,278
Investment banking	288,278
Asset management fees and investment income from managed funds	10,883
Interest	249,277
Other	27,004
Total revenues	1,021,960
Interest expense	203,416
Net revenues	818,544
Interest on mandatorily redeemable preferred interests of consolidated subsidiaries	10,961
Net revenues, less interest on mandatorily redeemable preferred interests of consolidated subsidiaries	807,583
Non-interest expenses:
Compensation and benefits	474,217
Non-compensation expenses:
Floor brokerage and clearing fees	46,155
Technology and communications	59,878
Occupancy and equipment rental	24,309
Business development	24,927
Professional services	24,135
Bad debt provision	1,945
Goodwill impairment	0
Other	12,530
Total non-compensation expenses	193,879
Total non-interest expenses	668,096
Earnings before income taxes	139,487
Income tax expense	48,645
Net earnings	90,842
Net earnings attributable to noncontrolling interests	10,704
Net earnings attributable to Jefferies Group LLC/ common stockholders	$ 80,138
Earnings per common share:
Basic (USD per share)	$ 0.35
Diluted (USD per share)	0.35
Dividends declared per common share (USD per share)	$ 0.075
Weighted average common shares:
Basic (in shares)	213,732
Diluted (in shares)	217,844