Financial Instruments and Fair Value Disclosures - (Narrative) (Details)	3 Months Ended
	Feb. 28, 2017 USD ($) homes community	Feb. 29, 2016 USD ($) homes communities community
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Active communities	750	681
Number of communities assessed for impairment | community	16	28
Number of homesites assessed for impairment | homes	589	1,178
Inventory with potential indicators of impairment	$ 102,900,000	$ 169,800,000
Valuation adjustments to inventory	$ 0	$ 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	12.70%
Discount rate	12.40%
Delinquency rate	7.00%
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