Financial Instruments and Fair Value Disclosures - (Fair Value Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	May 31, 2017	Nov. 30, 2016
Rialto | Fair Value, Measurements, Recurring | RMF loans held-for-sale
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Aggregate principal balance	$ 283,200		$ 127,800
Aggregate fair value of loans (below) in excess of principal balance	2,500		(900)
Rialto | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset	285,747		126,947
Rialto | Fair Value, Measurements, Recurring | Credit default swaps | Level 2
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset	1,510		2,863
Financial liability		$ 3,982	377
Rialto | Fair Value, Measurements, Recurring | Interest rate swaps and swap futures | Level 1
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial liability	2,318		6
Lennar Financial Services
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Investments available-for-sale	57,784		53,570
Lennar Financial Services | Mortgage loan commitments
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset	17,500		7,400
Lennar Financial Services | Forward contracts
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset			26,500
Financial liability	5,500
Lennar Financial Services | Fair Value, Measurements, Recurring | RMF loans held-for-sale
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Aggregate principal balance	635,000		931,000
Aggregate fair value of loans (below) in excess of principal balance	26,600		8,400
Lennar Financial Services | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Investments available-for-sale	57,784		53,570
Lennar Financial Services | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset	661,649		939,405
Lennar Financial Services | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	27,721		23,930
Lennar Financial Services | Fair Value, Measurements, Recurring | Mortgage loan commitments | Level 2
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Financial asset	17,543		7,437
Lennar Financial Services | Fair Value, Measurements, Recurring | Forward contracts | Level 2
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]
Forward contracts	$ (5,529)		$ 26,467