Construction and Development, Estimated Remaining Costs to Complete

No definition available.

Name:	len_ConstructionandDevelopmentEstimatedRemainingCoststoComplete
Namespace Prefix:	len_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Construction and Development, Remaining Costs to Complete, Percent

+ References

No definition available.

+ Details

Name:	len_ConstructionandDevelopmentRemainingCoststoCompletePercent
Namespace Prefix:	len_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Guarantor Obligations, Minimum Requirement for Subsidiaries

+ References

No definition available.

+ Details

Name:	len_GuarantorObligationsMinimumRequirementforSubsidiaries
Namespace Prefix:	len_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line of Credit Facility, Accordion Feature

+ References

No definition available.

+ Details

Name:	len_LineofCreditFacilityAccordionFeature
Namespace Prefix:	len_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Increase (Decrease) in Maximum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	len_LineofCreditFacilityIncreaseDecreaseinMaximumBorrowingCapacity
Namespace Prefix:	len_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=len_LennarHomebuildingEastCentralWestHoustonandOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=len_FourPointOneTwoFivePercentSeniorNotesDueTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=len_FourPointFiveZeroZeroPercentSeniorNotesDueTwoThousandTwentyFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=len_CreditFacilityDueinJune2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=len_CreditFacilityDueinJune2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=len_CreditFacilityDueinJune2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=len_PerformanceLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=len_FinancialLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Lennar Homebuilding Senior Notes and Other Debts Payable (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Feb. 28, 2018	Feb. 28, 2017	Jan. 31, 2018	Nov. 30, 2017
Senior Notes
Debt Instrument [Line Items]
Proceeds from senior notes and debt issuance costs			$ 589,152,000
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 \| Surety Bond
Debt Instrument [Line Items]
Outstanding performance and surety bonds		$ 2,400,000,000
Uncompleted site improvements amount		$ 1,200,000,000
Uncompleted site improvements percent		50.00%
Lennar Homebuilding \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,600,000,000		$ 2,000,000,000.0
Lennar Homebuilding \| Unsecured revolving credit facility \| Credit Facility Due in June 2020
Debt Instrument [Line Items]
Maximum borrowing capacity		50,000,000
Lennar Homebuilding \| Unsecured revolving credit facility \| Credit Facility Due in June 2022
Debt Instrument [Line Items]
Maximum borrowing capacity		2,100,000,000
Lennar Homebuilding \| Unsecured revolving credit facility \| Credit Facility Due in June 2018
Debt Instrument [Line Items]
Maximum borrowing capacity		70,000,000
Accordion feature		420,000,000
Lennar Homebuilding \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		260,000,000
Lennar Homebuilding \| Performance Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		500,000,000
Letters of credit outstanding		471,000,000.0			$ 384,400,000
Lennar Homebuilding \| Financial Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding		164,700,000			127,400,000
Lennar Homebuilding \| Senior Notes
Debt Instrument [Line Items]
Debt issuance cost		$ 38,600,000			$ 33,500,000
Lennar Homebuilding \| Senior Notes \| 4.125% senior notes due 2022
Debt Instrument [Line Items]
Interest rate		4.125%
Lennar Homebuilding \| Senior Notes \| 4.500% senior notes due 2024
Debt Instrument [Line Items]
Interest rate		4.50%
Subsequent Event \| Lennar Homebuilding \| Unsecured revolving credit facility \| Credit Facility Due in June 2018
Debt Instrument [Line Items]
Accordion feature	$ 245,000,000
Increase in commitment	$ 175,000,000