Land Held for Divestiture (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Schedule of net gain loss on land held for divestiture [Abstract]
Sales of land held for divestiture	$ 74,150	$ 0	$ 0
Cost of sales of land held for divestiture	(56,247)	0	0
Gain on extinguishment of debt of land held for divestiture	4,373	0	0
Net gain on closed transactions of land held for divestiture	22,276	0	0
Impairment of land held for divestiture	(15,796)	(115,654)	0
Net gain (loss) on land held for divestiture activity	$ 6,480	$ (115,654)	$ 0