Land Held for Divestiture (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Land Held for Divestiture disclosures [Abstract]
Net gain (loss) on sales of land held for divestiture of unconsolidated entities	$ 828,000	$ (1,481,000)	$ 681,000	$ (1,481,000)
Impairment of investments in unconsolidated entities	0	(40,406,000)	0	(40,406,000)
Net gain (loss) on land held for divestiture activity of unconsolidated entities	$ 828,000	$ (41,887,000)	$ 681,000	$ (41,887,000)