Lennar Homebuilding Investments in Unconsolidated Entities (Total Debt Of Unconsolidated Entities) (Details)	9 Months Ended	12 Months Ended
	Aug. 31, 2018 USD ($) joint_venture	Nov. 30, 2017 USD ($) joint_venture
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated entities debt repayment guarantee | joint_venture	3	3
Lennar Homebuilding
Schedule of Equity Method Investments [Line Items]
Non-recourse bank debt and other debt (partner’s share of several recourse)	$ 51,364,000	$ 64,197,000
Non-recourse land seller debt and other debt	1,497,000	1,997,000
Non-recourse debt with completion guarantees	234,310,000	255,903,000
Non-recourse debt without completion guarantees (1)	869,486,000	351,800,000
Non-recourse debt to the Company	1,156,657,000	673,897,000
The Company’s maximum recourse exposure	69,005,000	69,181,000
Debt issuance costs	(13,192,000)	(5,747,000)
Total debt	$ 1,212,470,000	$ 737,331,000
The Company’s maximum recourse exposure as a % of total JV debt	6.00%	9.00%
Senior Notes | FivePoint Unconsolidated Entity
Schedule of Equity Method Investments [Line Items]
Senior notes	$ 500,000,000