Land Held for Divestiture (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Land Held for Divestiture disclosures [Abstract]
Net gain (loss) on sales of land held for divestiture of unconsolidated entities	$ 186,000	$ (283,000)	$ 867,000	$ (1,764,000)
Impairment of investments in unconsolidated entities	0	0	0	(40,406,000)
Net gain (loss) on land held for divestiture activity of unconsolidated entities	$ 186,000	$ (283,000)	$ 867,000	$ (42,170,000)