Financial Instruments and Fair Value Disclosures - (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2016 USD ($) homes community	Aug. 31, 2015 USD ($) homes community communities	Aug. 31, 2015 USD ($) homes community communities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Active communities	691	670	670
Number of communities assessed for impairment | community	16	15
Number of homesites assessed for impairment | homes	444	453
Inventory with potential indicators of impairment	$ 134.7	$ 74.0	$ 74.0
Valuation adjustments to inventory			$ 15.4
Number of homesites impaired | homes			138
Number of communities impaired | community			2
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Carrying value of inventory		$ 68.6	$ 68.6
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	16.60%
Discount rate	12.30%
Delinquency rate	7.60%
Commitments to Sell MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Open commitments	$ 1,300.0