Land Held for Divestiture (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2012
Indicative bids [Member]
Fair value of land held for divestiture [Line Items]
Fair value of impairment of land held for divestiture	$ 15,663
Fair Value Valuation Technique Impairment of Real Estate	Indicative bids
Fair Value Unobservable Input Impairment of Real Estate	Indicative bids
Fair Value Range of Input Values Impairment of Real Estate	N/A	[1]
Discounted cash flow [Member]
Fair value of land held for divestiture [Line Items]
Fair value of impairment of land held for divestiture	$ 926
Fair Value Valuation Technique Impairment of Real Estate	Discounted cash flows	[2]
Fair Value Unobservable Input Impairment of Real Estate	N/A
Fair Value Range of Input Values Impairment of Real Estate	N/A

[1] These fair value measurements were developed by third party sources, subject to the Company’s corroboration for reasonableness.

[2] The Company used a discounted cash flow technique to estimate fair value; however, due to the estimated holding period being less than twelve months, the impact of discounting was deemed immaterial.