Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended								12 Months Ended
		Dec. 01, 2019	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017	Dec. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash equivalents			$ 302,500				$ 385,200				$ 302,500	$ 385,200
Schedule of Equity Method Investments [Line Items]
Revenues											4,552,747	4,547,002	$ 4,368,529
Pretax income (loss)			164,967	$ 91,936	$ 56,761	$ 34,511	128,936	$ 114,676	$ 78,308	$ 46,045	348,175	367,965	289,995
Income Tax Expense (Benefit)											(79,400)	(197,600)	(109,400)
Net Income (Loss) Attributable to Parent			123,167	$ 68,136	$ 47,461	$ 30,011	96,836	$ 87,476	$ 57,308	$ (71,255)	268,775	170,365	$ 180,595
Inventories			3,704,602				3,582,839				3,704,602	3,582,839
Assets			5,015,482				5,073,571				5,015,482	5,073,571
Retained earnings			2,157,183				1,897,168				2,157,183	1,897,168		$ 1,908,778
Share-based Payment Arrangement, Expense, Tax Benefit											5,300	1,000
Contract with Customer, Liability			$ 22,382				$ 19,491				$ 22,382	$ 19,491
Retained earnings														11,610
Earnings per share: Diluted (usd per share)			$ 1.31	$ 0.73	$ 0.51	$ 0.31	$ 0.96	$ 0.87	$ 0.57	$ (0.82)	$ 2.85	$ 1.71	$ 1.85
Impairment of Real Estate											$ 14,000	$ 26,100	$ 20,600
Property and equipment, net			$ 65,043				$ 24,283				65,043	24,283
Less accumulated depreciation	[1]		60,338				20,148				60,338	20,148
Depreciation expense											27,158	2,530	2,791
Advertising costs incurred											43,600	37,300	34,400
Expensed legal fees											16,700	12,400	14,000
Accounting Standards Update 2014-09 [Member]
Schedule of Equity Method Investments [Line Items]
Inventories							0					0	0	(35,288)
Property and equipment, net							0					0	0	31,194
Amounts without the Adoption of ASC 606
Schedule of Equity Method Investments [Line Items]
Pretax income (loss)											346,191
Income Tax Expense (Benefit)											(78,900)
Net Income (Loss) Attributable to Parent											267,291
Retained earnings			2,144,090								$ 2,144,090
Earnings per share: Diluted (usd per share)											$ 2.85
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
Schedule of Equity Method Investments [Line Items]
Pretax income (loss)											$ 1,984
Income Tax Expense (Benefit)											500
Net Income (Loss) Attributable to Parent											1,484
Retained earnings			13,093								$ 13,093			11,610
Earnings per share: Diluted (usd per share)											$ 0
Financial services
Schedule of Equity Method Investments [Line Items]
Cost of Goods and Services Sold											$ (4,333)	(3,844)	(3,430)
Selling, General and Administrative Expense											(4,333)	(3,844)	(3,430)
Operating Income (Loss)											10,756	9,363	8,834
Revenues											15,089	13,207	12,264
Pretax income (loss)											22,986	16,664	13,068
Assets			38,396				12,380				38,396	12,380		32,108
Financial services | Amounts without the Adoption of ASC 606
Schedule of Equity Method Investments [Line Items]
Revenues											14,211
Assets			17,790								17,790
Financial services | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
Schedule of Equity Method Investments [Line Items]
Revenues											878
Assets			20,606								20,606			19,728
Homebuilding:
Schedule of Equity Method Investments [Line Items]
Cost of Goods and Services Sold											(3,708,928)	(3,743,920)	(3,646,468)
Selling, General and Administrative Expense											(497,350)	(444,154)	(426,394)
Operating Income (Loss)											331,380	345,721	283,403
Revenues											4,537,658	4,533,795	4,356,265
Pretax income (loss)											325,189	351,301	$ 276,927
Inventories			3,704,602				3,582,839				3,704,602	3,582,839		3,547,551
Assets			4,977,086				5,061,191				4,977,086	5,061,191
Deferred tax assets, net			364,493				441,820				364,493	441,820		437,796
Property and equipment, net			65,043				$ 24,283				65,043	$ 24,283		55,477
Homebuilding: | Amounts without the Adoption of ASC 606
Schedule of Equity Method Investments [Line Items]
Cost of Goods and Services Sold											(3,740,337)
Selling, General and Administrative Expense											(464,105)
Operating Income (Loss)											330,274
Revenues											4,534,716
Inventories			3,746,567								3,746,567
Deferred tax assets, net			369,017								369,017
Property and equipment, net			26,067								26,067
Homebuilding: | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
Schedule of Equity Method Investments [Line Items]
Cost of Goods and Services Sold											(31,409)
Selling, General and Administrative Expense											33,245
Operating Income (Loss)											1,106
Revenues											2,942
Inventories			(41,965)								(41,965)			(35,288)
Deferred tax assets, net			(4,524)								(4,524)			(4,024)
Property and equipment, net			$ 38,976								$ 38,976			$ 31,194
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Homebuilding:
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage											99.70%
Computer Hardware and Software [Member] | Minimum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											2 years
Computer Hardware and Software [Member] | Maximum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											5 years
Model Furnishings and Sales Office Improvements [Member] | Minimum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											2 years
Model Furnishings and Sales Office Improvements [Member] | Maximum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											3 years
Furniture and Fixtures [Member] | Minimum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											3 years
Furniture and Fixtures [Member] | Maximum
Schedule of Equity Method Investments [Line Items]
Estimated useful life for depreciation of property and equipment											10 years
Forecast [Member] | Accounting Standards Update 2016-02 [Member]
Schedule of Equity Method Investments [Line Items]
Operating Lease, Right-of-Use Asset		$ 31,000
Operating Lease Right of Use Liability		31,000
Cumulative Effect on Retained Earnings, Net of Tax		$ 1,500

[1] The balance at November 30, 2019 reflects a change in the classification of certain community sales office and other marketing- and model home-related costs and related accumulated amortization from inventories to property and equipment, net due to our adoption of ASC 606 effective December 1, 2018, as described in Note 1 – Summary of Significant Accounting Policies