Rialto Segment (Narrative) (Details)		3 Months Ended		9 Months Ended		12 Months Ended
		Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Aug. 31, 2017 USD ($) transaction	Aug. 31, 2016 USD ($) transaction	Nov. 30, 2015	Dec. 31, 2010 business	Nov. 30, 2016 USD ($)		Nov. 30, 2010
Segment Reporting Information [Line Items]
Originations of loans receivable				$ 57,375,000	$ 56,507,000
Assets	[1]	$ 16,939,373,000		16,939,373,000				$ 15,361,781,000
Liabilities	[2]	9,279,913,000		9,279,913,000				8,150,214,000
Distributions of earnings from unconsolidated entities				59,927,000	52,787,000
Rialto
Segment Reporting Information [Line Items]
Debt issuance costs		3,400,000		3,400,000				2,900,000
Assets	[1]	1,195,407,000		1,195,407,000				1,276,210,000
Liabilities		703,329,000		703,329,000				707,980,000
Real estate owned, net		123,695,000		123,695,000				243,703,000
Loans receivable, net		52,779,000		52,779,000				111,608,000
Borrowings under facilities		$ 617,152,000		$ 617,152,000				622,335,000
Percentage interest in loans		75.00%		75.00%
Maximum percentage of LLC equity units employees are eligible to receive as part of carried interest incentive plan						40.00%
Investments held-to-maturity		$ 142,462,000		$ 142,462,000				71,260,000
Rialto | Warehouse Repurchase Facility
Segment Reporting Information [Line Items]
Borrowings under facilities		182,700,000		182,700,000				223,500,000
Rialto | CMBS
Segment Reporting Information [Line Items]
Investments held-to-maturity		142,500,000		142,500,000				71,300,000	[1]
Impairment charges for CMBS securities		0	$ 0	$ 0	0
Rialto | CMBS | Minimum
Segment Reporting Information [Line Items]
Discount rate as a percentage of face value for held-to-maturity securities				9.00%
Coupon rate for held-to-maturity securities				1.30%
Rialto | CMBS | Maximum
Segment Reporting Information [Line Items]
Discount rate as a percentage of face value for held-to-maturity securities				84.00%
Coupon rate for held-to-maturity securities				5.00%
Rialto | Rialto Real Estate Fund, LP
Segment Reporting Information [Line Items]
Advanced distributions from unconsolidated entities		800,000	$ 2,100,000	$ 3,900,000	9,500,000
Distributions of earnings from unconsolidated entities		10,600,000		29,400,000
Rialto | Rialto Mortgage Finance
Segment Reporting Information [Line Items]
Originations of loans receivable				1,300,000,000	1,200,000,000
Proceeds from sale of loans held-for-sale				$ 1,100,000,000	$ 1,300,000,000
Number of securitization transactions | transaction				8	7
Receivables from securitization		0		$ 0				199,800,000
Rialto | Rialto Mortgage Finance | Warehouse Repurchase Facility
Segment Reporting Information [Line Items]
Borrowings under facilities		148,300,000		148,300,000				180,200,000
Rialto | Rialto Mortgage Finance | Performing Financing Receivable
Segment Reporting Information [Line Items]
Originations of loans receivable				57,400,000	$ 55,700,000
Rialto | Rialto Mortgage Finance | Held-for-sale
Segment Reporting Information [Line Items]
Originations of loans receivable				1,300,000,000	$ 1,200,000,000
Rialto | Variable Interest Entity, Primary Beneficiary
Segment Reporting Information [Line Items]
Assets		85,800,000		85,800,000				213,800,000
Liabilities		2,700,000		2,700,000				$ 10,300,000
Rialto | Variable Interest Entity, Primary Beneficiary | FDIC Portfolio
Segment Reporting Information [Line Items]
Assets		85,800,000		85,800,000
Real estate owned, net		49,000,000		49,000,000
Loans receivable, net		$ 19,200,000		$ 19,200,000
Rialto | FDIC Portfolio
Segment Reporting Information [Line Items]
Managing member equity interests acquired										40.00%
Number of businesses acquired | business							2

[1] Under certain provisions of Accounting Standards Codification ("ASC") Topic 810, Consolidations, ("ASC 810") the Company is required to separately disclose on its condensed consolidated balance sheets the assets owned by consolidated variable interest entities ("VIEs") and liabilities of consolidated VIEs as to which neither Lennar Corporation, or any of its subsidiaries, has any obligations.As of August 31, 2017, total assets include $812.9 million related to consolidated VIEs of which $9.7 million is included in Lennar Homebuilding cash and cash equivalents, $0.2 million in Lennar Homebuilding receivables, net, $81.3 million in Lennar Homebuilding finished homes and construction in progress, $189.6 million in Lennar Homebuilding land and land under development, $386.6 million in Lennar Homebuilding consolidated inventory not owned, $4.6 million in Lennar Homebuilding investments in unconsolidated entities, $13.1 million in Lennar Homebuilding other assets, $85.8 million in Rialto assets and $42.0 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] Under certain provisions of Accounting Standards Codification ("ASC") Topic 810, Consolidations, ("ASC 810") the Company is required to separately disclose on its condensed consolidated balance sheets the assets owned by consolidated variable interest entities ("VIEs") and liabilities of consolidated VIEs as to which neither Lennar Corporation, or any of its subsidiaries, has any obligations.As of August 31, 2017, total liabilities include $390.2 million related to consolidated VIEs as to which there was no recourse against the Company, of which $4.7 million is included in Lennar Homebuilding accounts payable, $381.7 million in Lennar Homebuilding liabilities related to consolidated inventory not owned, $1.1 million in Lennar Homebuilding other liabilities and $2.7 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 and $10.3 million in Rialto liabilities.