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Basis of Presentation and Significant Accounting Policies (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018	Nov. 30, 2018	Dec. 01, 2018
Cash equivalents	$ 11,400		$ 11,400		$ 385,200
Other comprehensive income (loss)	68,100	$ 87,500	145,600	$ 73,500
Retained earnings	2,042,034		2,042,034		1,897,168	$ 1,908,778
Customer deposits	26,800		26,800		$ 19,500
Financial Service [Member]
Contract assets	20,100		20,100			19,700
Home Building [Member] \| Product Concentration Risk [Member] \| Total Revenues [member]
Percentage of total revenue					99.70%
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member]
Retained earnings	$ 10,387		$ 10,387			11,610
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Accounting Standards Update 2014-09 [Member] \| Financial Service [Member]
Contract assets						$ 19,728