Supplemental Financial Information (Narrative) (Details)	9 Months Ended
	Aug. 31, 2017 USD ($)
Senior Notes | 4.75% senior notes due December 2017
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes | 6.95% senior notes due 2018
Debt Instrument [Line Items]
Interest rate	6.95%
Senior Notes | 4.125% senior notes due December 2018
Debt Instrument [Line Items]
Interest rate	4.125%
Senior Notes | 4.500% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Senior Notes | 4.50% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Senior Notes | 4.750% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes | 4.750% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes | 4.875% senior notes due December 2023
Debt Instrument [Line Items]
Interest rate	4.875%
Senior Notes | 4.750% senior notes due 2025
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding
Debt Instrument [Line Items]
Guarantee by subsidiaries	$ 75,000,000
Lennar Homebuilding | 4.75% senior notes due December 2017
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | 6.95% senior notes due 2018
Debt Instrument [Line Items]
Interest rate	6.95%
Lennar Homebuilding | 4.125% senior notes due December 2018
Debt Instrument [Line Items]
Interest rate	4.125%
Lennar Homebuilding | 4.500% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | 4.50% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | 4.750% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | 4.125% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.125%
Lennar Homebuilding | 4.750% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | 4.875% senior notes due December 2023
Debt Instrument [Line Items]
Interest rate	4.875%
Lennar Homebuilding | 4.500% senior notes due 2024
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | 4.750% senior notes due 2025
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | Senior Notes | 6.875% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	6.875%
Lennar Homebuilding | Senior Notes | 4.125% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.125%