Leucadia and Related Transactions - Additional Information (Detail) (USD $)		3 Months Ended		0 Months Ended	3 Months Ended			6 Months Ended	3 Months Ended		1 Months Ended
	May 31, 2014 3.875% Convertible Senior Debentures due 2029 [Member]	Feb. 28, 2013 3.25% Cumulative Convertible Preferred Shares [Member]	Feb. 28, 2013 Series A-1 Convertible Cumulative Preferred Stock [Member]	Mar. 31, 2013 Leucadia [Member]	Feb. 28, 2013 Leucadia [Member]	May 31, 2013 Leucadia [Member] Predecessor [Member]	Feb. 28, 2013 Leucadia [Member] Predecessor [Member]	May 31, 2014 Leucadia [Member] 3.875% Convertible Senior Debentures due 2029 [Member]	Feb. 28, 2013 Leucadia [Member] 3.25% Cumulative Convertible Preferred Shares [Member]	Feb. 28, 2013 Jefferies Group Inc. [Member] Series A-1 Convertible Cumulative Preferred Stock [Member]	Feb. 28, 2013 Jefferies High Yield Holdings, LLC [Member]
Business Acquisition [Line Items]
Exchange ratio					0.81
Convertible Cumulative Preferred Stock					$ 125,000,000				$ 125,000,000	$ 125,000,000
Convertible Cumulative Preferred Stock, dividend rate		3.25%	3.25%		3.25%				3.25%	3.25%
Debt instrument principal amount								345,000,000
Debt instrument interest rate	3.875%							3.875%
Debt instrument maturity year								2029
Cost of assets acquired					4,754,101,000
Business acquisition transaction cost						9,000,000	2,100,000
Goodwill					1,720,380,000
Third party noncontrolling interests redeemed											347,600,000
Redeemable preferred interests				$ 362,300,000