Supplemental Financial Information (Narrative) (Details)	3 Months Ended
	Feb. 28, 2018 USD ($)
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 | 4.125% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.125%
Lennar Homebuilding | 4.500% senior notes due 2024
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | Senior Notes | 1.625% convertible senior notes due 2018
Debt Instrument [Line Items]
Interest rate	1.625%
Lennar Homebuilding | Senior Notes | 8.375% senior notes due 2018
Debt Instrument [Line Items]
Interest rate	8.375%
Lennar Homebuilding | Senior Notes | 6.95% senior notes due 2018
Debt Instrument [Line Items]
Interest rate	6.95%
Lennar Homebuilding | Senior Notes | 4.125% senior notes due December 2018
Debt Instrument [Line Items]
Interest rate	4.125%
Lennar Homebuilding | Senior Notes | 0.25% convertible senior notes due 2019 (1)
Debt Instrument [Line Items]
Interest rate	0.25%
Lennar Homebuilding | Senior Notes | 4.500% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | Senior Notes | 4.50% senior notes due 2019
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | Senior Notes | 4.750% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | Senior Notes | 6.25% senior notes due December 2021 (2)
Debt Instrument [Line Items]
Interest rate	6.25%
Lennar Homebuilding | Senior Notes | 4.125% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.125%
Lennar Homebuilding | Senior Notes | 5.375% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	5.375%
Lennar Homebuilding | Senior Notes | 4.750% senior notes due 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | Senior Notes | 4.875% senior notes due December 2023
Debt Instrument [Line Items]
Interest rate	4.875%
Lennar Homebuilding | Senior Notes | 4.500% senior notes due 2024
Debt Instrument [Line Items]
Interest rate	4.50%
Lennar Homebuilding | Senior Notes | 5.875% senior notes due 2024 (2)
Debt Instrument [Line Items]
Interest rate	5.875%
Lennar Homebuilding | Senior Notes | 4.750% senior notes due 2025
Debt Instrument [Line Items]
Interest rate	4.75%
Lennar Homebuilding | Senior Notes | 6.625% senior notes due 2020
Debt Instrument [Line Items]
Interest rate	6.625%
Lennar Homebuilding | Senior Notes | 2.95% senior notes due 2020
Debt Instrument [Line Items]
Interest rate	2.95%
Lennar Homebuilding | Senior Notes | 8.375% senior notes due 2021
Debt Instrument [Line Items]
Interest rate	8.375%
Lennar Homebuilding | Senior Notes | 5.25% senior notes due 2026 (2)
Debt Instrument [Line Items]
Interest rate	5.25%
Lennar Homebuilding | Senior Notes | 5.00% senior notes due 2027
Debt Instrument [Line Items]
Interest rate	5.00%
Lennar Homebuilding | Senior Notes | 4.75% senior notes due 2027
Debt Instrument [Line Items]
Interest rate	4.75%