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Financial Instruments and Fair Value Disclosures - (Unobservable Inputs Used in Discounted Cash Flow Model to Determine the Fair Value of Communities) (Details) $ / homes in Thousands	May 31, 2021 $ / homes	May 31, 2020 $ / homes
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	0.20
Minimum | Average selling price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	635,000	201,000
Minimum | Absorption rate per quarter (homes)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	11	3
Maximum | Average selling price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs		970,000
Maximum | Absorption rate per quarter (homes)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs		15

X

- Definition

Inventory, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	len_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- 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

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=len_MeasurementInputAbsorptionRatePerQuarterMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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