CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Feb. 28, 2018	Nov. 30, 2017
Cash, Cash Equivalents and Restricted Cash by Category [Abstract]
Cash and cash equivalents	$ 5,016,863	$ 5,164,492
Cash and securities segregated and on deposit for regulatory purposes with clearing and depository organizations	767,824	478,284
Total cash, cash equivalents and restricted cash	$ 5,784,687	$ 5,642,776