Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 31, 2020	Nov. 30, 2021		Nov. 30, 2020		Nov. 30, 2019	Dec. 01, 2020	Dec. 01, 2019	Dec. 01, 2018	Nov. 30, 2018
Schedule of Equity Method Investments [Line Items]
Cash equivalents		$ 15,400		$ 508,500
Depreciation expense		28,600		28,400		$ 27,200
Advertising costs incurred		28,000		29,300		43,600
Legal Fees		11,500		11,600		16,700
Stockholder's equity		3,019,475		2,665,769		2,383,122				$ 2,087,500
Operating lease, right-of-use asset		27,693	[1]	36,270	[1]			$ 31,200
Operating lease liability		29,481	[2]	$ 38,000	[2]			$ 31,200
Reclassification of stranded tax effects		$ 1,600
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other assets		Other assets				Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Accounts payable and accrued expenses		Accounts payable and accrued expenses				Accounts payable and accrued expenses
Retained Earnings
Schedule of Equity Method Investments [Line Items]
Stockholder's equity		$ 2,379,364		$ 1,868,896		2,157,183				1,897,168
Reclassification of stranded tax effects				1,643
Cumulative Effect, Period of Adoption, Adjustment
Schedule of Equity Method Investments [Line Items]
Stockholder's equity				(226)		1,510				11,610
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Schedule of Equity Method Investments [Line Items]
Stockholder's equity				(226)		$ 1,510	$ (200)	$ 1,500	$ 11,600	$ 11,610
Homebuilding
Schedule of Equity Method Investments [Line Items]
Operating lease, right-of-use asset		27,508		35,967
Operating lease liability		$ 29,279		$ 37,668
Product Concentration Risk | Revenue Benchmark | Homebuilding
Schedule of Equity Method Investments [Line Items]
Concentration risk (in percent)		99.70%		99.60%
Minimum | Computer Hardware and Software
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		2 years
Minimum | Model Furnishings and Sales Office Improvements
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		2 years
Minimum | Furniture and Fixtures
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		3 years
Maximum | Computer Hardware and Software
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		15 years
Maximum | Model Furnishings and Sales Office Improvements
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		3 years
Maximum | Furniture and Fixtures
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment		10 years
Employee Severance
Schedule of Equity Method Investments [Line Items]
Severance charges	$ 6,700

[1] Represents lease right-of-use assets within our homebuilding operations and financial services operations of $27.5 million and $.2 million, respectively, at November 30, 2021, and $36.0 million and $.3 million, respectively, at November 30, 2020.

[2] Represents lease liabilities within our homebuilding operations and financial services operations of $29.3 million and $.2 million, respectively, at November 30, 2021, and $37.7 million and $.3 million, respectively, at November 30, 2020