Leucadia and Related Transactions - Additional Information (Detail) $ in Thousands		3 Months Ended	9 Months Ended
	Mar. 01, 2013 USD ($)	Feb. 28, 2013 USD ($)	Nov. 30, 2013 USD ($)	Nov. 30, 2015
3.875% Convertible Senior Debentures due 2029 [Member]
Business Acquisition [Line Items]
Debt instrument interest rate	3.875%			3.875%
Series A-1 Convertible Cumulative Preferred Stock [Member]
Business Acquisition [Line Items]
Convertible Cumulative Preferred Stock, dividend rate	3.25%
Leucadia [Member]
Business Acquisition [Line Items]
Exchange ratio	0.81
Convertible Cumulative Preferred Stock	$ 125,000
Convertible Cumulative Preferred Stock, dividend rate	3.25%
Cost of assets acquired	$ 4,754,101
Business acquisition transaction cost		$ 2,100	$ 11,500
Goodwill	1,720,380
Redeemable preferred interests	$ 362,300
Leucadia [Member] | 3.875% Convertible Senior Debentures due 2029 [Member]
Business Acquisition [Line Items]
Debt instrument interest rate	3.875%			3.875%
Debt instrument maturity year	2029
Debt instrument principal amount	$ 345,000
Leucadia [Member] | 3.25% Cumulative Convertible Preferred Shares [Member]
Business Acquisition [Line Items]
Convertible Cumulative Preferred Stock	$ 125,000
Convertible Cumulative Preferred Stock, dividend rate	3.25%
Jefferies Group Inc. [Member] | Series A-1 Convertible Cumulative Preferred Stock [Member]
Business Acquisition [Line Items]
Convertible Cumulative Preferred Stock	$ 125,000
Convertible Cumulative Preferred Stock, dividend rate	3.25%
Jefferies High Yield Holdings, LLC [Member]
Business Acquisition [Line Items]
Third party noncontrolling interests redeemed	$ 347,600