Quarterly Results (unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Gain (Loss) on Extinguishment of Debt									$ (6,800)	$ 0	$ (5,685)
Provisional impact of Tax Reform				$ 111,200				$ 111,200
Impact of Tax Reform	$ 1,300				$ 1,300				0	112,458	0
Revenues	1,558,675	$ 1,160,786	$ 1,021,803	811,483	1,348,609	$ 1,225,347	$ 1,101,423	871,623
Gross profits	306,834	216,029	177,019	139,604	245,931	222,893	189,222	141,192
Inventory Impairments and Land Option Contract Abandonments	4,148	5,251	4,337	3,555	9,069	8,414	6,526	4,985	17,291	28,994	25,232
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
Net income	$ 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
Earnings per share: Basic (usd per share)	$ 1.37	$ 0.77	$ 0.54	$ 0.34	$ 1.09	$ 0.99	$ 0.65	$ (0.82)	$ 3.04	$ 1.93	$ 2.09