Homebuilding Senior Notes and Other Debts Payable (Narrative) (Details) - Homebuilding - USD ($)	3 Months Ended
Feb. 29, 2020	Nov. 30, 2019
Debt Instrument [Line Items]
Guarantee by subsidiaries	$ 75,000,000
Unsecured revolving credit facility \| Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowings	2,450,000,000
Unsecured revolving credit facility \| Credit Facility Due in June 2020
Debt Instrument [Line Items]
Maximum borrowings	50,000,000
Letter of Credit \| Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowings	500,000,000
Senior Notes
Debt Instrument [Line Items]
Debt issuance cost	$ 21,200,000	$ 22,900,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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