Commitments, Contingencies and Guarantees - Additional Information (Details) $ in Millions	12 Months Ended
	Nov. 30, 2021 USD ($)
Loss Contingencies [Line Items]
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee	$ 351.3
Standby letters of credit
Loss Contingencies [Line Items]
Letters of credit commitments	$ 5.1
Letters of credit commitments expiration period	1 year
Clients
Loss Contingencies [Line Items]
Loan commitments outstanding to clients	$ 85.0
Jefferies Capital Partners LLC
Loss Contingencies [Line Items]
Outstanding equity commitments	10.7
Third parties
Loss Contingencies [Line Items]
Outstanding equity commitments	100.0
Other investments
Loss Contingencies [Line Items]
Outstanding equity commitments	$ 105.1