Basis of Presentation and Significant Accounting Policies (Cumulative Effect of Changes on Consolidated Balance Sheets Resulting From Adoption of ASC 606) (Details) - USD ($) $ in Thousands	Aug. 31, 2021	May 31, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Nov. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	$ 4,655,875		$ 3,897,482
Property and equipment, net	72,470		65,547
Total assets	5,756,347		5,356,442
Retained earnings	2,218,217		1,868,896
Equity	2,841,733	$ 2,886,865	2,665,769	$ 2,565,308	$ 2,490,354	$ 2,383,122
Retained Earnings [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Equity	2,218,217	$ 2,081,288	1,868,896	$ 2,326,060	$ 2,255,742	2,157,183
Cumulative Effect, Period of Adoption, Adjustment [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Equity						1,510
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Equity						$ 1,510
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Equity			(226)
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Equity			(226)
Home Building [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	4,655,875		3,897,482
Deferred tax assets, net	194,845		231,067
Property and equipment, net	72,470		65,547
Total assets	5,718,929		5,320,240
Financial Service [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets	37,418		36,202
Contract assets	$ 23,100		$ 21,500