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, 2019	Dec. 01, 2018	Nov. 30, 2018	Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	$ 3,919,076		$ 3,582,839
Property and equipment, net	64,119		24,283
Total assets	5,035,170		5,073,571
Retained earnings	2,042,034	$ 1,908,778	1,897,168
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories		(35,288)		$ 0
Property and equipment, net		31,194		$ 0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	2,031,647		1,897,168
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	10,387	11,610
Home Building [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	3,919,076	3,547,551	3,582,839
Deferred tax assets, net	402,095	437,796	441,820
Property and equipment, net	64,119	55,477	24,283
Total assets	5,003,259		5,061,191
Home Building [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	3,964,873		3,582,839
Deferred tax assets, net	405,719		441,820
Property and equipment, net	24,431		24,283
Home Building [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	(45,797)	(35,288)
Deferred tax assets, net	(3,624)	(4,024)
Property and equipment, net	39,688	31,194
Financial Service [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets	31,911	32,108	12,380
Contract assets	20,100	19,700
Financial Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets	11,791		$ 12,380
Financial Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets	$ 20,120
Contract assets		$ 19,728