Organization and Basis of Presentation (Details) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020 USD ($)	May 31, 2019 USD ($)	May 31, 2020 USD ($) segment	May 31, 2019 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | segment			2
Debt Instrument [Line Items]
Increase of commissions and other fees	$ 632,995	$ 602,335	$ 1,408,936	$ 1,049,742
Decrease of other revenue	(47,275)	44,327	(17,546)	56,157
Commissions and Other Fees
Debt Instrument [Line Items]
Increase of commissions and other fees	$ 243,267	167,698	$ 422,802	322,840
Reclassified Presentation of Certain Other Fees | Commissions and Other Fees
Debt Instrument [Line Items]
Increase of commissions and other fees		7,900		15,700
Decrease of other revenue		$ (7,900)		$ (15,700)