Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,194,256	$ 999,013	$ 913,970	$ 1,075,935	$ 1,558,675	$ 1,160,786	$ 1,021,803	$ 811,483
Gross profits	241,624	199,462	168,634	188,920	306,834	216,029	177,019	139,604
Inventory Impairments and Land Option Contract Abandonments	11,730	6,888	4,379	5,672	4,148	5,251	4,337	3,555	$ 28,669	$ 17,291	$ 28,994
Pretax income (loss)	126,091	101,315	67,789	68,848	164,967	91,936	56,761	34,511	364,043	348,175	367,965
Net income	$ 106,091	$ 78,415	$ 51,989	$ 59,748	$ 123,167	$ 68,136	$ 47,461	$ 30,011	$ 296,243	$ 268,775	$ 170,365
Earnings per share: Basic (usd per share)	$ 1.16	$ 0.86	$ 0.57	$ 0.66	$ 1.37	$ 0.77	$ 0.54	$ 0.34	$ 3.26	$ 3.04	$ 1.93
Earnings per share: Diluted (usd per share)	$ 1.12	$ 0.83	$ 0.55	$ 0.63	$ 1.31	$ 0.73	$ 0.51	$ 0.31	$ 3.13	$ 2.85	$ 1.71
Restructuring Cost and Reserve [Line Items]
Loss on early extinguishment of debt					$ (6,800)				$ 0	$ (6,800)	$ 0
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance charges			$ 6,700