Basis of Presentation and Significant Accounting Policies (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	May 31, 2020	Dec. 01, 2019	Nov. 30, 2019	May 31, 2019	Dec. 01, 2018	Nov. 30, 2018
Increase(decrease) in Homes To Be Delivered	(14.00%)
Equity	$ 2,565,308	$ 2,262,229	$ 2,565,308	$ 2,262,229	$ 2,490,354		$ 2,383,122	$ 2,195,210		$ 2,087,500
Severance Costs			6,700
Cash equivalents	594,500		594,500				302,500
Other comprehensive income (loss)	78,400	68,100	190,200	145,600
Retained earnings	2,326,060		2,326,060				2,157,183
Financial Service [Member]
Contract assets	21,600		21,600				20,600
Retained Earnings [Member]
Equity	$ 2,326,060	$ 2,042,034	$ 2,326,060	$ 2,042,034	$ 2,255,742		2,157,183	$ 1,981,795		$ 1,897,168
Cumulative Effect, Period of Adoption, Adjustment [Member]
Equity									$ 11,610
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Equity						$ 1,500	1,510
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member]
Equity						$ 1,600
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Equity									$ 11,610
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member]
Equity							1,510
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
Equity							$ 1,643