Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Cumulative Effect Transition (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Dec. 01, 2018	Nov. 30, 2018	Nov. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	$ 3,704,602		$ 3,582,839
Property and equipment, net	65,043		24,283
Assets	5,015,482		5,073,571
Retained earnings	2,157,183	$ 1,908,778	1,897,168
Financial services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Assets	38,396	32,108	12,380
Homebuilding:
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	3,704,602	3,547,551	3,582,839
Property and equipment, net	65,043	55,477	24,283
Deferred tax assets, net	364,493	437,796	441,820
Assets	4,977,086		5,061,191
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories		(35,288)	0	$ 0
Property and equipment, net		31,194	$ 0	$ 0
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	13,093	11,610
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Financial services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Assets	20,606	19,728
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Homebuilding:
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventories	(41,965)	(35,288)
Property and equipment, net	38,976	31,194
Deferred tax assets, net	$ (4,524)	$ (4,024)