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	Feb. 28, 2019	Dec. 01, 2018	Nov. 30, 2018	Feb. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	$ 3,683,763		$ 3,582,839
Property and equipment, net	55,330		24,283
Total assets	5,173,656		5,073,571
Retained earnings	1,936,523	$ 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	1,925,928		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	10,595	11,610
Home Building [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	3,683,763	3,547,551	3,582,839
Deferred tax assets, net	433,295	437,796	441,820
Property and equipment, net	55,330	55,477	24,283
Total assets	5,144,381		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	3,722,475		3,582,839
Deferred tax assets, net	437,019		441,820
Property and equipment, net	22,132		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	(38,712)	(35,288)
Deferred tax assets, net	(3,724)	(4,024)
Property and equipment, net	33,198	31,194
Financial Service [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total assets	29,275	32,108	12,380
Contract assets	19,800	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	9,442		$ 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	$ 19,833
Contract assets		$ 19,728