Land Held for Divestiture (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Schedule of net gain loss on land held for divestiture [Abstract]
Sales of land held for divestiture	$ 0	$ 25,384,000	$ 1,768,000	$ 59,894,000
Cost of sales of land held for divestiture	0	(26,804,000)	(323,000)	(51,976,000)
Gain on extinguishment of debt of land held for divestiture	0	2,227,000	0	2,227,000
Net gain on closed transactions of land held for divestiture	0	807,000	1,445,000	10,145,000
Bad debt expense	0	0	(9,000,000)	0
Impairment of land held for divestiture	0	0	0	(15,796,000)
Net gain (loss) on land held for divestiture activity	$ 0	$ 807,000	$ (7,555,000)	$ (5,651,000)