Financial Instruments and Fair Value Disclosures - (Narrative) (Details)	3 Months Ended	6 Months Ended
	May 31, 2016 USD ($) homes community communities	May 31, 2017 USD ($) homes community	May 31, 2016 USD ($) communities	May 31, 2015 USD ($) homes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Discount rate		20.00%
Active communities	689	732	689
Number of communities assessed for impairment | community	20	16
Number of homesites assessed for impairment | homes	652	677
Inventory with potential indicators of impairment	$ 116,000,000.0	$ 70,000,000.0	$ 116,000,000.0
Valuation adjustments to inventory		$ 7,500,000	$ 0
Number of homes impaired | homes				469
Number of communities impaired | community		6
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Carrying value of homesites impaired				$ 12,000,000.0
Level 3 | Mortgage servicing rights | Lennar Financial Services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Mortgage prepayment rate		14.10%
Discount rate		12.30%
Delinquency rate		6.10%
Commitments to Sell MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Open commitments		$ 1,200,000,000