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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details)		3 Months Ended				9 Months Ended
		Aug. 31, 2021 USD ($) delivery lot property Rate	Nov. 30, 2020 USD ($) property	Aug. 31, 2020 USD ($) delivery		Aug. 31, 2021 USD ($) delivery lot Rate		Aug. 31, 2020 USD ($) delivery
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Number of land parcels or communities evaluated for recoverability | property		4	11
Carrying value of communities or land parcels evaluated for impairment		$ 31,400,000	$ 123,400,000			$ 31,400,000
Inventory impairment charges		6,300,000		$ 6,500,000		9,900,000		$ 11,600,000
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges		$ 98,000,000	$ 113,100,000			$ 98,000,000
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges		12	16			12
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Average Selling price	[1]	$ 949,400		$ 301,600		$ 471,000		$ 301,600
Deliveries per month | delivery	[1]	4		2		4		1
Discount Rate, Percent	[1]	18.00%		17.00%				17.00%
Minimum [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount Rate, Percent | Rate	[1]					18.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Average Selling price		$ 949,400		$ 1,010,100	[1]	$ 949,400	[1]	$ 1,010,100	[1]
Deliveries per month | delivery		4		2	[1]	5	[1]	4	[1]
Discount Rate, Percent		18.00%		18.00%				18.00%
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%				19.00%
Land Option Contract Abandonment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Land option contract abandonment charges		$ 400,000		$ 400,000		$ 1,300,000		$ 5,400,000
[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.

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- Definition

Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges.

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Fair value estimate input, average selling price

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Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges.

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Number of land parcels or communities evaluated for recoverability.

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

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The loss recognized on termination of a contract.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 275
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84167019&loc=d3e54681-109401

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