Land Held for Divestiture (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Schedule of net gain loss on land held for divestiture [Abstract]
Sales of land held for divestiture	$ 1,056,000	$ 34,510,000	$ 1,768,000	$ 34,510,000
Cost of sales of land held for divestiture	(63,000)	(25,172,000)	(323,000)	(25,172,000)
Net gain on closed transactions of land held for divestiture	993,000	9,338,000	1,445,000	9,338,000
Bad debts expense	(9,000,000)	0	(9,000,000)	0
Impairment of land held for divestiture	0	(15,796,000)	0	(15,796,000)
Net loss on land held for divestiture activity	$ (8,007,000)	$ (6,458,000)	$ (7,555,000)	$ (6,458,000)