Net Capital Requirements - Net Capital, Adjusted and Excess Net Capital (Detail) $ in Thousands	Aug. 31, 2016 USD ($)
Jefferies [Member]
Net Capital Requirements [Line Items]
Net Capital	$ 1,424,378
Excess Net Capital	1,340,682
Jefferies Execution [Member]
Net Capital Requirements [Line Items]
Net Capital	7,330
Excess Net Capital	$ 7,080

Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	us-gaap_NetCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant