Land Held for Divestiture (Details1) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Land Held for Divestiture disclosures [Abstract]
Net loss on sales of land held for divestiture of unconsolidated entities	$ (1,481,000)	$ 0	$ (1,481,000)	$ 0
Impairment of investments in unconsolidated entities	(40,406,000)	0	(40,406,000)	0
Net loss on land held for divestiture activites of unconsolidated entities	$ (41,887,000)	$ 0	$ (41,887,000)	$ 0