Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Detail) - USD ($) $ in Thousands	Aug. 31, 2018	Nov. 30, 2017
Securities borrowing arrangements
Gross Amounts	$ 7,369,908	$ 7,721,803
Netting in Consolidated Statement of Financial Condition	0	0
Net Amounts in Consolidated Statement of Financial Condition	7,369,908	7,721,803
Additional Amounts Available for Setoff	(529,662)	(966,712)
Available Collateral	(1,088,612)	(1,032,629)
Net Amount	5,751,634	5,722,462
Reverse repurchase agreements
Gross Amounts	11,634,035	14,858,297
Netting in Consolidated Statement of Financial Condition	(7,974,976)	(11,168,738)
Net Amounts in Consolidated Statement of Financial Condition	3,659,059	3,689,559
Additional Amounts Available for Setoff	(187,426)	(463,973)
Available Collateral	(3,441,009)	(3,207,147)
Net Amount	30,624	18,439
Securities lending arrangements
Gross Amounts	2,531,504	2,843,911
Netting in Consolidated Statement of Financial Condition	0	0
Net Amounts in Consolidated Statement of Financial Condition	2,531,504	2,843,911
Additional Amounts Available for Setoff	(529,662)	(966,712)
Available Collateral	(1,977,558)	(1,795,408)
Net Amount	24,284	81,791
Repurchase agreements
Gross Amounts	17,839,459	19,829,249
Netting in Consolidated Statement of Financial Condition	(7,974,976)	(11,168,738)
Net Amounts in Consolidated Statement of Financial Condition	9,864,483	8,660,511
Additional Amounts Available for Setoff	(187,426)	(463,973)
Available Collateral	(8,632,482)	(7,067,512)
Net Amount	1,044,575	1,129,026
Securities borrowing arrangements	5,717,100	5,678,600
Securities borrowing arrangements, collateral	5,544,100	5,516,700
Securities borrowing arrangements, repurchase agreements	1,019,600	1,084,400
Securities borrowing arrangements, repurchase agreements, pledged securities collateral	$ 1,054,100	1,115,900
Obligation To Return Securities Received As Collateral [Member]
Securities lending arrangements
Gross Amounts		103
Netting in Consolidated Statement of Financial Condition		0
Net Amounts in Consolidated Statement of Financial Condition		103
Additional Amounts Available for Setoff		0
Available Collateral		(103)
Net Amount		0
Securities Received As Collateral [Member]
Securities borrowing arrangements
Gross Amounts		103
Netting in Consolidated Statement of Financial Condition		0
Net Amounts in Consolidated Statement of Financial Condition		103
Additional Amounts Available for Setoff		0
Available Collateral		(103)
Net Amount		$ 0