Financial Instruments and Fair Value Disclosures - (Narrative) (Details)	6 Months Ended
	May 31, 2019 USD ($) community homes	May 31, 2018 USD ($) community homes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Active communities | community	1,320	1,320
Number of communities assessed for impairment | community	52	19
Number of homesites assessed for impairment | homes	2,213	1,013
Inventory with potential indicators of impairment	$ 415,200,000	$ 113,200,000
Valuation adjustments to inventory	0	$ 17,600,000
Number of homes impaired | homes		570
Number of communities impaired | community		3
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Carrying value of homesites impaired		$ 31,300,000
Commitments to Sell MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Open commitments	$ 1,500,000,000
Mortgage Prepayment Rate | Level 3 | Financial Services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs for valuation of mortgage servicing rights	0.163
Discount Rate | Level 3 | Financial Services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs for valuation of mortgage servicing rights	0.124
Delinquency Rate | Level 3 | Financial Services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs for valuation of mortgage servicing rights	0.077