Fair Value Disclosures (Level 4 inventory fv) (Details 3) $ in Thousands	3 Months Ended												12 Months Ended
	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory impairments and write-offs													$ 42,360	$ 35,156	$ 14,794
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	71	69	64	49	43	55	65	64	51	53	46	57
Number of Communities impaired	7	3	6	5	6	5	4	5	1	4	6	2
Fair Value Of Communities Net Of Impairment Charges	$ 18,910	$ 5,436	$ 36,159	$ 37,282	$ 24,692	$ 43,063	$ 21,811	$ 13,318	$ 6,982	$ 5,965	$ 25,092	$ 8,372	18,910	24,692	6,982
Inventory impairments and write-offs	$ 6,695	$ 1,100	$ 17,495	$ 5,785	$ 4,025	$ 9,065	$ 13,325	$ 3,736	$ 1,500	$ 1,360	$ 2,935	$ 4,000	$ 31,075	$ 30,151	$ 9,795