Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2021	Dec. 01, 2020	Nov. 30, 2020
Schedule of Equity Method Investments [Line Items]
Cash equivalents	$ 508,200	$ 15,800
Depreciation expense	36,400	32,300	$ 28,600
Advertising costs incurred	34,200	37,100	28,000
Legal Fees	10,400	10,600	11,500
Stockholder's equity	3,810,140	3,660,795	3,019,475		$ 2,665,769
Retained Earnings
Schedule of Equity Method Investments [Line Items]
Stockholder's equity	$ 3,676,924	$ 3,143,578	$ 2,379,364		1,868,896
Cumulative Effect, Period of Adoption, Adjustment
Schedule of Equity Method Investments [Line Items]
Stockholder's equity					(226)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Schedule of Equity Method Investments [Line Items]
Stockholder's equity				$ (200)	$ (226)
Product Concentration Risk | Revenue Benchmark | Homebuilding
Schedule of Equity Method Investments [Line Items]
Concentration risk (in percent)	99.50%	99.70%	99.70%
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