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Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Provisional impact of Tax Refrom				$ 111,200
Impact of Tax Reform	$ 1,300								$ 112,458	$ 0	$ 0
Revenues	1,348,609	$ 1,225,347	$ 1,101,423	871,623	$ 1,403,138	$ 1,144,001	$ 1,002,794	$ 818,596	4,547,002	4,368,529	3,594,646
Gross profits	245,931	222,893	189,222	141,192	255,442	188,110	155,382	119,697
Inventory Impairments and Land Option Contract Abandonments	9,069	8,414	6,526	4,985	7,110	8,113	6,001	4,008	28,994	25,232	52,812
Pretax income (loss)	128,936	114,676	78,308	46,045	137,346	79,208	51,982	21,459	367,965	289,995	149,315
Net income	$ 96,836	$ 87,476	$ 57,308	$ (71,255)	$ 84,346	$ 50,208	$ 31,782	$ 14,259	$ 170,365	$ 180,595	$ 105,615
Earnings per share: Diluted (usd per share)	$ 0.96	$ 0.87	$ 0.57	$ (0.82)	$ 0.84	$ 0.51	$ 0.33	$ 0.15	$ 1.71	$ 1.85	$ 1.12
Earnings per share: Basic (usd per share)	$ 1.09	$ 0.99	$ 0.65	$ (0.82)	$ 0.97	$ 0.58	$ 0.37	$ 0.17	$ 1.93	$ 2.09	$ 1.23

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