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	Dec. 01, 2019	May 31, 2020	Nov. 30, 2019	May 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories		$ 3,607,465	$ 3,704,602
Property and equipment, net		65,764	65,043
Total assets		5,042,002	5,015,482
Retained earnings		2,255,742	2,157,183
Accounting Standards Update 2018-02 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	$ 1,600
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories		0		$ (35,288)
Property and equipment, net		0		$ 31,194
Home Building [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories		3,607,465	3,704,602
Deferred tax assets, net		257,571	364,493
Property and equipment, net		65,764	65,043
Total assets		5,003,145	4,977,086
Financial Service [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets		38,857	38,396
Contract assets		$ 21,500	$ 20,600