Summary of Significant Accounting Policies Summary of Significant Accounting Policies - ASC 606 Impact on Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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
Revenue, Initial Application Period Cumulative Effect Transition [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
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
Homebuilding:
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 4,537,658	$ 4,533,795	$ 4,356,265
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
Pretax income (loss)									325,189	351,301	276,927
Financial services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									15,089	13,207	12,264
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
Pretax income (loss)									22,986	$ 16,664	$ 13,068
Amounts without the Adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Pretax income (loss)									346,191
Income Tax Expense (Benefit)									(78,900)
Net Income (Loss) Attributable to Parent									$ 267,291
Earnings per share: Diluted (usd per share)									$ 2.85
Amounts without the Adoption of ASC 606 | Homebuilding:
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 4,534,716
Cost of Goods and Services Sold									(3,740,337)
Selling, General and Administrative Expense									(464,105)
Operating Income (Loss)									330,274
Amounts without the Adoption of ASC 606 | Financial services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									14,211
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Pretax income (loss)									1,984
Income Tax Expense (Benefit)									500
Net Income (Loss) Attributable to Parent									$ 1,484
Earnings per share: Diluted (usd per share)									$ 0
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Homebuilding:
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 2,942
Cost of Goods and Services Sold									(31,409)
Selling, General and Administrative Expense									33,245
Operating Income (Loss)									1,106
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Financial services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues									$ 878