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Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Loss Contingencies [Line Items]
Product Warranty Accrual, Preexisting, Increase (Decrease)	[1]									$ (652)	$ (7,238)	$ (17,471)
Valuation Allowance, Deferred Tax Asset, Change in Amount										(13,000)	(3,400)
Revenues		$ 1,191,942	$ 913,283	$ 811,050	$ 678,371	$ 985,783	$ 843,157	$ 622,969	$ 580,121	3,594,646	3,032,030	2,400,949
Gross profits		167,667	151,902	121,465	108,694	171,482	133,099	97,631	86,739
Inventory Impairments and Land Option Contract Abandonments		36,054	3,052	11,740	1,966	5,075	3,532	536	448	52,812	9,591	39,431
Pretax income (loss)		55,028	53,463	24,797	16,027	69,917	33,954	12,673	10,499	149,315	127,043	94,949
Net income		$ 37,528	$ 39,363	$ 15,597	$ 13,127	$ 44,017	$ 23,254	$ 9,573	$ 7,799	$ 105,615	$ 84,643	$ 918,349
Earnings per share: Diluted (usd per share)		$ 0.40	$ 0.42	$ 0.17	$ 0.14	$ 0.43	$ 0.23	$ 0.10	$ 0.08	$ 1.12	$ 0.85	$ 9.25
Earnings per share: Basic (usd per share)		$ 0.44	$ 0.46	$ 0.18	$ 0.15	$ 0.48	$ 0.25	$ 0.10	$ 0.08	$ 1.23	$ 0.92	$ 10.26
Land Option Contract Abandonment [Member]
Loss Contingencies [Line Items]
Loss on Contract Termination										$ 3,232	$ 1,561	$ 1,803
Southeast [Member] | Land Option Contract Abandonment [Member]
Loss Contingencies [Line Items]
Loss on Contract Termination										1,750	$ 984	$ 254
Metro Washington, D.C. [Member] | Southeast [Member] | Land Option Contract Abandonment [Member]
Loss Contingencies [Line Items]
Loss on Contract Termination										$ 1,400
[1] Adjustments for 2016, 2015 and 2014 included the reclassification of certain estimated minimum probable recoveries to receivables in connection with the above-noted water intrusion-related issues. Adjustments in 2014 also included the reclassification of estimated minimum probable recoveries to establish a separate accrual for a water intrusion-related inquiry, as described below. The adjustments for each year had no impact on our consolidated statements of operations. There were no estimated minimum probable recoveries netted against our warranty liability at November 30, 2016.

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