Schedule I (PARENT COMPANY ONLY) (CONDENSED STATEMENTS OF FINANCIAL CONDITION) (Details) - Parent Company [Member] - USD ($) $ in Thousands	Nov. 30, 2015	Nov. 30, 2014
ASSETS
Cash and cash equivalents	$ 824,239	$ 971,182
Cash and securities segregated and on deposited for regulatory purposes or deposited with clearing and depository organizations	66,203	61,489
Financial instruments owned, at fair value	138,820	192,110
Investments in managed funds	34,933	54,840
Loans to and investments in related parties	520,550	501,289
Investment in subsidiaries	4,892,454	5,226,946
Advances to subsidiaries	1,423,175	1,904,013
Subordinated notes receivable	2,924,479	2,485,000
Other assets	591,751	671,653
Total assets	11,416,604	12,068,522
LIABILITIES AND EQUITY
Financial instruments sold, not yet purchased, at fair value	21,024	29,826
Accrued expenses and other liabilities	271,779	300,496
Long-term debt	5,641,892	6,313,617
Total liabilities	5,934,695	6,643,939
EQUITY
Member’s paid-in capital	5,526,855	5,439,256
Accumulated other comprehensive loss:
Currency translation adjustments	(36,811)	(9,654)
Additional minimum pension liability	(8,135)	(5,019)
Total accumulated other comprehensive loss	(44,946)	(14,673)
Total member’s equity	5,481,909	5,424,583
Total liabilities and equity	$ 11,416,604	$ 12,068,522