Fair Value Disclosures (Level 4 inventory fv) (Details 3) $ in Thousands	3 Months Ended					12 Months Ended
	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	$ 1,281				$ 1,144
Operating communities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory Write-down	$ 600					$ 22,300
Fair Value, Measurements, 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)	43	44	40	52	58
Number of Communities Impaired (in ones)	2	3	3	1	4
Fair Value Of Communities Net Of Impairment Charges	$ 1,713	$ 8,726	$ 13,527	$ 16,235	$ 24,968	$ 8,726
Inventory Write-down	$ 600	$ 4,300	$ 6,000	$ 11,100	$ 900