Schedule I (PARENT COMPANY ONLY) (CONDENSED STATEMENTS OF CASH FLOWS) (Details) - Parent Company [Member] - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 01, 2013	Feb. 28, 2013	Nov. 30, 2013	Nov. 30, 2015	Nov. 30, 2014
Leucadia [Member]
Cash paid (received) during the period for:
Redeemable preferred interests	$ 362,300
Successor [Member]
Cash flows from operating activities:
Net earnings			$ 161,191	$ 93,534	$ 157,560
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities:
Amortization			(62,305)	(76,945)	(80,424)
Undistributed earnings of subsidiaries			(153,751)	(71,739)	(125,450)
Income on loans to and investments in related parties			(58,197)	(40,460)	(67,965)
Distributions received on investments in related parties			0	40,500	35,562
Other adjustments			(15,471)	(98,870)	(78,064)
Net change in assets and liabilities:
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations			(7,151)	(4,714)	(28,155)
Financial instruments owned			76,724	53,290	(45,950)
Loans to and investments in related parties			0	0	0
Investments in managed funds			3,230	19,907	(1,028)
Other assets			108,877	77,064	47,666
Financial instruments sold, not yet purchased			107	(8,802)	21,462
Accrued expenses and other liabilities			(52,944)	(36,397)	38,477
Net cash (used in) provided by operating activities			310	(53,632)	(126,309)
Cash flows from investing activities:
Investments in, advances to and subordinated notes receivable from subsidiaries			(74,742)	420,797	82,143
Loans to and investments in related parties			128,638	(19,301)	(469)
Cash received from contingent consideration			3,796	4,444	6,253
Net cash provided by (used in) investing activities			57,692	405,940	87,927
Cash flows from financing activities:
Excess tax benefits from the issuance of share-based awards			3,054	749	1,921
Proceeds from short-term borrowings			0	750,000	1,160,000
Payments on short-term borrowings			0	(750,000)	(1,160,000)
Net proceeds from issuance of senior notes, net of issuance costs			0	0	681,222
Repayment of long-term debt			0	(500,000)	(250,000)
Payments on repurchase of common stock			0	0	0
Payments on dividends			0	0	0
Proceeds from exercise of stock options, not including tax benefits			0	0	0
Net cash (used in) provided by financing activities			3,054	(499,251)	433,143
Net (decrease) increase in cash and cash equivalents			61,056	(146,943)	394,761
Cash and cash equivalents at beginning of period	515,365		515,365	971,182	576,421
Cash and cash equivalents at end of period		$ 515,365	576,421	824,239	971,182
Cash paid (received) during the period for:
Interest			238,817	329,926	330,261
Income taxes, net			56,130	$ (5,859)	$ 111,542
Predecessor [Member]
Cash flows from operating activities:
Net earnings		80,138
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities:
Amortization		3,666
Undistributed earnings of subsidiaries		(89,318)
Income on loans to and investments in related parties		0
Distributions received on investments in related parties		0
Other adjustments		22,350
Net change in assets and liabilities:
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations		(5,000)
Financial instruments owned		(63,244)
Loans to and investments in related parties		(111,022)
Investments in managed funds		(2,300)
Other assets		(1,544)
Financial instruments sold, not yet purchased		1,054
Accrued expenses and other liabilities		5,529
Net cash (used in) provided by operating activities		(159,691)
Cash flows from investing activities:
Investments in, advances to and subordinated notes receivable from subsidiaries		(235,097)
Loans to and investments in related parties		0
Cash received from contingent consideration		1,203
Net cash provided by (used in) investing activities		(233,894)
Cash flows from financing activities:
Excess tax benefits from the issuance of share-based awards		5,682
Proceeds from short-term borrowings		0
Payments on short-term borrowings		0
Net proceeds from issuance of senior notes, net of issuance costs		991,469
Repayment of long-term debt		0
Payments on repurchase of common stock		(166,541)
Payments on dividends		(15,799)
Proceeds from exercise of stock options, not including tax benefits		57
Net cash (used in) provided by financing activities		814,868
Net (decrease) increase in cash and cash equivalents		421,283
Cash and cash equivalents at beginning of period	$ 515,365	94,082	$ 515,365
Cash and cash equivalents at end of period		515,365
Cash paid (received) during the period for:
Interest		70,385
Income taxes, net		$ (33,103)