Schedule I (PARENT COMPANY ONLY) - Additional Information (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Nov. 30, 2020
Debt Instrument [Line Items]
Long-term debt	$ 8,039,826	$ 6,895,680
Unsecured long-term debt
Debt Instrument [Line Items]
Long-term debt	7,315,844	6,655,948
Unsecured long-term debt | Structured notes
Debt Instrument [Line Items]
Long-term debt	1,843,598	1,712,245
Unsecured long-term debt | Structured notes | Jefferies Group Capital Finance Inc
Debt Instrument [Line Items]
Long-term debt	991,500
Parent company
Debt Instrument [Line Items]
Maximum amount payable under guarantees	725,800
Long-term debt	$ 7,315,844	$ 6,655,949