CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017	Nov. 30, 2017
Cash flows from operating activities:
Net earnings	$ 98,008	$ 69,790	$ 37,189	$ 183,810
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization			5,743	752
Income on loans to and investments in related parties			(24,834)	(54,495)
Distributions received on investments in related parties			1,910	6,189
Other adjustments			(94,524)	40,160
Net change in assets and liabilities:
Securities deposited with clearing and depository organizations			64,880	108
Receivables:
Brokers, dealers and clearing organizations			10,499	(832,729)
Customers			(413,508)	(372,368)
Fees, interest and other			9,390	(87,192)
Securities borrowed			97,924	(143,554)
Financial instruments owned			(1,594,717)	(8,909)
Securities purchased under agreements to resell			(176,922)	(452,154)
Other assets			76,192	(109,591)
Payables:
Brokers, dealers and clearing organizations			520,766	(969,230)
Customers			489,060	300,774
Securities loaned			(266,028)	616,701
Financial instruments sold, not yet purchased			812,496	598,801
Securities sold under agreements to repurchase			139,287	1,818,042
Accrued expenses and other liabilities			(422,224)	116,605
Net cash provided by (used in) operating activities			(727,421)	651,720
Cash flows from investing activities:
Contributions to loans to and investments in related parties			(1,906,071)	(2,642,607)
Distributions from loans to and investments in related parties			1,873,000	2,579,746
Net payments on premises and equipment			(36,061)	(39,918)
Cash received from contingent consideration			0	1,250
Net cash used in investing activities			(69,132)	(101,529)
Cash flows from financing activities:
Proceeds from short-term borrowings			372,481	133,928
Payments on short-term borrowings			(297,708)	(219,086)
Proceeds from issuance of long-term debt, net of issuance costs			1,321,714	866,600
Repayment of long-term debt			(1,022,615)	(75,730)
Dividend distribution			(200,000)	0
Net proceeds from (payments on) other secured financings			246,714	(369,626)
Net change in bank overdrafts			(2,722)	(1,544)
Proceeds from noncontrolling interests			10	0
Net cash provided by financing activities			417,874	334,542
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(9,370)	4,773
Net increase (decrease) in cash, cash equivalents and restricted cash			(388,049)	889,506
Cash, cash equivalents and restricted cash at beginning of period			5,642,776	4,286,513	$ 4,286,513
Cash, cash equivalents and restricted cash at end of period	$ 5,254,727	$ 5,176,019	5,254,727	5,176,019	$ 5,642,776
Cash paid during the period for
Interest			608,178	488,705
Income taxes, net			$ 115,748	$ 3,576