Fair Value Disclosures (Level 4 inventory fv) (Details 3) $ in Thousands	3 Months Ended					12 Months Ended
	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	$ 1,267				$ 1,031
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenues	92,530				$ 133,170
Operating communities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	$ 1,100					$ 675
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Operating Communities Tested (in ones)	53	53	66	80	65
Number of Communities Impaired (in ones)	1	1	0	1	0
Fair Value Of Communities Net Of Impairment Charges	$ 419	$ 1,113	$ 0	$ 2,754	$ 0	$ 1,113
Inventory Write-down	1,100	$ 375	$ 0	$ 300	0
City Living [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	1,100				0
North [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	35				94
South [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	25				747
Mid-Atlantic [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	32				1
Pacific [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	$ 66				$ 11