Summary of Significant Accounting Policies (Narrative) (Details)		12 Months Ended
		Nov. 30, 2017 USD ($) communities community homes		Nov. 30, 2016 USD ($) communities homes		Nov. 30, 2015 USD ($)	Dec. 31, 2010 business	Jan. 19, 2018 USD ($) asset
Segment Reporting Information [Line Items]
Advertising costs		$ 47,000,000		$ 40,900,000		$ 47,900,000
Cash held in escrow		$ 569,800,000		$ 460,500,000
Escrow deposit period		3 days
Number of active communities | communities		761		693
Number of communities with potential indicators of impairment | communities		10		11
Number of homesites with potential indicators of impairment | homes		630		663
Carrying value of homesites with potential indicators of impairment		$ 100,400,000		$ 180,900,000
Valuation adjustments for homesites		$ 7,900,000		0
Number of homesites impaired | homes		473
Number of communities impaired | community		7
Trading securities		$ 0		0
Deferred tax assets, valuation allowance		6,423,000		5,773,000
Self-insurance reserve		90,200,000		87,600,000
Assets		18,745,034,000	[1]	15,361,781,000	[1]	14,419,509,000
Liabilities	[2]	$ 10,758,902,000		8,150,214,000
FDIC Portfolio
Segment Reporting Information [Line Items]
Servicing fee, percentage		0.50%
Obligations under servicing agreement		$ 10,000,000
Ownership percentage, noncontrolling interest		60.00%
Operating properties
Segment Reporting Information [Line Items]
Estimated useful life		30 years
Leasehold improvements
Segment Reporting Information [Line Items]
Estimated useful life		5 years
Lennar Financial Services
Segment Reporting Information [Line Items]
Held-to-maturity securities		$ 52,327,000		41,991,000
Held-to-maturity securities, term		5 years
Available-for-sale securities		$ 57,439,000		53,570,000
Self-insurance reserve		57,700,000		57,400,000
Assets	[1]	1,689,508,000		1,754,672,000
Liabilities	[2]	1,177,814,000		1,318,283,000
Loans held-for-investment, net		44,193,000		30,004,000
Rialto
Segment Reporting Information [Line Items]
Held-to-maturity securities		179,659,000		71,260,000
Assets	[1]	1,153,840,000		1,276,210,000
Liabilities	[2]	720,056,000		707,980,000
Loans held-for-investment, net		1,933,000		111,608,000
Rialto | FDIC Portfolio
Segment Reporting Information [Line Items]
Ownership percentage							40.00%
Number of equity interests limited liability companies acquired | business							2
Rialto | Variable Interest Entity, Primary Beneficiary | FDIC Portfolio
Segment Reporting Information [Line Items]
Assets		48,800,000		213,800,000
Cash		23,800,000
Real estate owned - held-and-used, net		20,000,000
Liabilities		2,200,000		10,300,000
Loans held-for-investment, net		$ 1,600,000
Rialto | REO, commercial
Segment Reporting Information [Line Items]
Estimated useful life		40 years
Rialto | REO, residential
Segment Reporting Information [Line Items]
Estimated useful life		27 years 6 months
Lennar Homebuilding
Segment Reporting Information [Line Items]
Interest incurred		$ 290,300,000		281,400,000		288,500,000
Interest capitalized		283,200,000		276,800,000		$ 276,100,000
Assets	[1]	15,190,961,000		11,804,768,000
Liabilities	[2]	$ 8,711,317,000		$ 6,005,978,000
Minimum | Furniture, Fixtures and Equipment
Segment Reporting Information [Line Items]
Estimated useful life		2 years
Maximum | Furniture, Fixtures and Equipment
Segment Reporting Information [Line Items]
Estimated useful life		10 years
Level 3
Segment Reporting Information [Line Items]
Carrying value of homesites impaired		$ 13,900,000
Communities
Segment Reporting Information [Line Items]
Discount rate		20.00%
Communities | Minimum
Segment Reporting Information [Line Items]
Discount rate		10.00%
Communities | Maximum
Segment Reporting Information [Line Items]
Discount rate		20.00%
Real Estate Owned | Minimum | Rialto
Segment Reporting Information [Line Items]
Capitalization rate		8.00%
Real Estate Owned | Maximum | Rialto
Segment Reporting Information [Line Items]
Capitalization rate		12.00%
Stock Option Awards
Segment Reporting Information [Line Items]
Expiration period		10 years
Subsequent Event | Rialto | Variable Interest Entity, Primary Beneficiary | FDIC Portfolio
Segment Reporting Information [Line Items]
Assets								$ 300,000
Number of assets | asset								4

[1] Under certain provisions of Accounting Standards Codification ("ASC") Topic 810, Consolidations, ("ASC 810") the Company is required to separately disclose on its consolidated balance sheets the assets of consolidated variable interest entities ("VIEs") that are owned by the consolidated VIEs and liabilities of consolidated VIEs as to which there is no recourse against the Company.As of November 30, 2017, total assets include $799.4 million related to consolidated VIEs of which $15.8 million is included in Lennar Homebuilding cash and cash equivalents, $0.2 million in Lennar Homebuilding receivables, net, $53.2 million in Lennar Homebuilding finished homes and construction in progress, $229.0 million in Lennar Homebuilding land and land under development, $393.3 million in Lennar Homebuilding consolidated inventory not owned, $4.6 million in Lennar Homebuilding investments in unconsolidated entities, $11.8 million in Lennar Homebuilding other assets, $48.8 million in Rialto assets and $42.7 million in Lennar Multifamily assets.As of November 30, 2016, total assets include $536.3 million related to consolidated VIEs of which $13.3 million is included in Lennar Homebuilding cash and cash equivalents, $0.2 million in Lennar Homebuilding receivables, net, $54.2 million in Lennar Homebuilding finished homes and construction in progress, $106.3 million in Lennar Homebuilding land and land under development, $121.0 million in Lennar Homebuilding consolidated inventory not owned, $4.6 million in Lennar Homebuilding investments in unconsolidated entities, $13.9 million in Lennar Homebuilding other assets, $213.8 million in Rialto assets and $8.8 million in Lennar Multifamily assets.

[2] As of November 30, 2017, total liabilities include $389.7 million related to consolidated VIEs as to which there was no recourse against the Company, of which $5.0 million is included in Lennar Homebuilding accounts payable, $380.7 million in Lennar Homebuilding liabilities related to consolidated inventory not owned, $1.8 million in Lennar Homebuilding other liabilities and $2.2 million in Rialto liabilities.As of November 30, 2016, total liabilities include $126.4 million related to consolidated VIEs as to which there was no recourse against the Company, of which $3.6 million is included in Lennar Homebuilding accounts payable, $110.0 million in Lennar Homebuilding liabilities related to consolidated inventory not owned, $2.5 million in Lennar Homebuilding other liabilities, $10.3 million in Rialto liabilities.