Financial Instruments and Fair Value Disclosures - (Narrative) (Details)	9 Months Ended
	Aug. 31, 2017 USD ($) homes community	Aug. 31, 2016 USD ($) homes community communities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Discount rate	20.00%
Active communities	753	691
Number of communities assessed for impairment | community	6	16
Number of homesites assessed for impairment | homes	499	444
Inventory with potential indicators of impairment	$ 31,900,000	$ 134,700,000
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
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	15.10%
Discount rate	12.30%
Delinquency rate	6.20%
Commitments to Sell MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Open commitments	$ 1,100,000,000