Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) $ in Thousands	3 Months Ended							9 Months Ended		12 Months Ended
	Jul. 31, 2021 USD ($) Homes_sold	Apr. 30, 2021 USD ($) Homes_sold	Jan. 31, 2021 USD ($) Homes_sold	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) numberOfCommunities	Jul. 31, 2020 USD ($)	Oct. 31, 2020 USD ($) numberOfCommunities
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down	$ 13,150				$ 6,690			$ 15,997	$ 21,934
Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down	11,105				2,764			11,105	$ 4,869
Fair Value, Nonrecurring [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Inventory Write-down								$ 11,100		$ 31,700
Number of Communities Impaired (in ones) | numberOfCommunities								5		9
Fair Value Of Communities Net Of Impairment Charges	25,600			$ 21,800				$ 25,600		$ 21,800
Minimum [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Sales Price Per Lot								33		33
Maximum [Member] | Land Owned for Future Communities [Member]
Fair value inputs, assets, quantitative information [Line Items]
Sales Price Per Lot								180		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%