Basis of Presentation and Significant Accounting Policies (Impacts of Adopting ASC 606) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 01, 2019	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Nov. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease right-of-use assets		$ 32,413		$ 32,413
Total revenues		913,970	$ 1,021,803	1,989,905	$ 1,833,286
Total pretax income		67,789	56,761	136,637	91,272
Income tax expense		(15,800)	(9,300)	(24,900)	(13,800)
Net income		$ 51,989	$ 47,461	$ 111,737	$ 77,472
Diluted earnings per share (in dollars per share)		$ 0.55	$ 0.51	$ 1.19	$ 0.82
Assets
Inventories		$ 3,607,465		$ 3,607,465		$ 3,704,602
Property and equipment, net		65,764		65,764		65,043
Total assets		5,042,002		5,042,002		5,015,482
Stockholders’ equity:
Retained earnings		2,255,742		2,255,742		2,157,183
Financial Service [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease right-of-use assets		300		300
Contract assets		21,500		21,500		20,600
Total revenues		3,690	$ 3,132	7,243	$ 5,827
Selling, general and administrative expenses		(883)	(1,040)	(1,845)	(2,064)
Operating income		2,807	2,092	5,398	3,763
Total pretax income		7,604	4,592	13,417	7,065
Assets
Total assets		38,857		38,857		38,396
Home Building [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease right-of-use assets		32,087		32,087		0
Total revenues		910,280	1,018,671	1,982,662	1,827,459
Construction and land costs		(744,453)	(843,744)	(1,630,506)	(1,514,599)
Selling, general and administrative expenses		(114,238)	(122,828)	(240,372)	(229,422)
Operating income		51,589	52,099	111,784	83,438
Total pretax income		60,185	52,169	123,220	84,207
Assets
Inventories		3,607,465		3,607,465		3,704,602
Deferred tax assets, net		257,571		257,571		364,493
Property and equipment, net		65,764		65,764		65,043
Total assets		5,003,145		5,003,145		$ 4,977,086
Accounting Standards Update 2016-02 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Lease right-of-use assets	$ 31,199		0		0
Cumulative Effect on Retained Earnings, Net of Tax	$ 1,500
Accounting Standards Update 2014-09 [Member]
Assets
Inventories		0	(35,288)	0	(35,288)
Property and equipment, net		$ 0	$ 31,194	$ 0	$ 31,194