Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details)		3 Months Ended		6 Months Ended
		May 31, 2020 USD ($) lot delivery Rate	May 31, 2019 USD ($) delivery Rate	May 31, 2020 USD ($) lot delivery property Rate	May 31, 2019 USD ($) delivery property Rate	Nov. 30, 2019 USD ($) property
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Number of land parcels or communities evaluated for recoverability | property				18	24
Carrying value of communities or land parcels evaluated for impairment		$ 148,300,000	$ 164,000,000.0	$ 148,300,000	$ 164,000,000.0
Inventory impairment charges		0	3,400,000	5,100,000	6,600,000
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges		$ 89,700,000		$ 89,700,000		$ 115,600,000
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges		16		16		19
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Average Selling price	[1]	$ 0	$ 315,000	$ 302,700	$ 315,000
Deliveries per month | delivery	[1]	0	4	1	1
Minimum [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount Rate, Percent | Rate	[1]	0.00%	17.00%	17.00%	17.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Average Selling price	[1]	$ 0	$ 398,500	$ 915,500	$ 1,045,400
Deliveries per month | delivery	[1]	0	4	4	4
Maximum [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount Rate, Percent | Rate	[1]	0.00%	17.00%	18.00%	17.00%
Land Option Contract Abandonment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Land option contract abandonment charges		$ 4,400,000	$ 900,000	$ 4,900,000	$ 1,300,000

[1] The ranges of inputs used in each period primarily reflect differences between the housing markets where each impacted community is located, rather than fluctuations in prevailing market conditions.