Commitments and Contingencies (Changes in the Warranty Liability) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	May 31, 2018	Nov. 30, 2017	May 31, 2017	Nov. 30, 2016
Loss Contingencies [Line Items]
Self Insurance Reserve		$ 178,773	$ 177,559	$ 178,773	$ 177,559	$ 176,715	$ 177,695	$ 156,505	$ 158,584
Expenses Associated with Self Insurance	[1]	5,554	5,573	14,264	13,811
Payments, Net of Recoveries for Self Insurance		(2,473)	(2,291)	(5,115)	(7,051)
Changes in the Warranty Liability
Balance at beginning of period		76,404	60,037	69,798	56,682
Warranties issued		9,590	10,041	27,243	25,965
Payments		(6,023)	(6,267)	(17,070)	(18,836)
Balance at end of period		79,971	63,811	79,971	63,811
Self Insurance [Member]
Loss Contingencies [Line Items]
Loss Contingency, Receivable		63,200		63,200			71,300
Increase (Decrease) in Insurance Liabilities	[2]	(1,023)	$ 17,772	(8,071)	$ 12,215
Warranty and Other [Member]
Loss Contingencies [Line Items]
Loss Contingency, Receivable		$ 4,800		$ 4,800			$ 4,100

[1] a)These expenses are included in selling, general and administrative expenses and are largely offset by contributions from subcontractors participating in the wrap-up policy.

[2] b)The amount for each period reflects changes in our self-insurance liability that were offset by changes in the receivable for estimated probable insurance and other recoveries to present our self-insurance liability on a gross basis. The amounts for the three months and nine months ended August 31, 2017 also included a $21.7 million change in estimate to increase our self-insurance liability based on an actuarially determined estimate that we believed had a higher probability of being adequate to cover future payments associated with unresolved claims, including claims incurred but not yet reported.