Variable Interest Entities (Narrative) (Details) $ in Millions	6 Months Ended
	May 31, 2017 USD ($) joint_venture	Nov. 30, 2016 USD ($) joint_venture
Variable Interest Entity [Line Items]
Consolidated VIEs assets	$ 575.7	$ 536.3
Consolidated VIEs liabilities	$ 144.1	$ 126.4
Number of Unconsolidated Entities Debt Repayment Guarantee | joint_venture	3	1
Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Decrease in consolidated inventory	$ 17.6
Non-refundable option deposits and pre-acquisition costs	91.1	$ 85.0
Financial Standby Letters of Credit | Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Letters of credit outstanding	41.1	45.1
Lennar Multifamily | Equity Commitments | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Obligations to make capital contributions to VIEs	(212.1)	(288.2)
Lennar Multifamily | Financial Standby Letters of Credit | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Obligations to make capital contributions to VIEs	(15.1)	(19.7)
Lennar Homebuilding | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Obligations to make capital contributions to VIEs	$ (72.9)	$ (43.4)
Number of Unconsolidated Entities Debt Repayment Guarantee | joint_venture	2