Document and Entity Information	3 Months Ended
	Feb. 28, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Feb. 28, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	JEFFERIES GROUP LLC
Entity Central Index Key	0001084580
Current Fiscal Year End Date	--11-30
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	0