Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) $ in Thousands	3 Months Ended						6 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($) Homes_sold	Jan. 31, 2021 USD ($) Homes_sold	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Oct. 31, 2020 USD ($) numberOfCommunities
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down	$ 1,581				$ 14,214		$ 2,847	$ 15,245
Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down	0				2,105		1,100	$ 2,105
Fair Value, Nonrecurring [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down									$ 31,700
Number of Communities Impaired (in ones) | numberOfCommunities									9
Fair Value Of Communities Net Of Impairment Charges			$ 21,800						$ 21,800
Minimum [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Sales Price Per Lot									33
Maximum [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Sales Price Per Lot									180
Operating communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down							$ 1,100		$ 675
Operating communities [Member] | Minimum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price		$ 2,003			$ 613
Sales Pace (in ones)		2			9
Fair Value Inputs, Discount Rate		14.30%			14.30%
Operating communities [Member] | Maximum [Member]
Fair value inputs, assets, quantitative information [Line Items]
Average selling price		$ 2,003			$ 789
Sales Pace (in ones)		2			9
Fair Value Inputs, Discount Rate		14.30%			14.30%