Consolidated Statements of Equity (Unaudited) (Parenthetical) (USD $) In Thousands	6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Net loss attributable to redeemable noncontrolling interest	$ 1,879	$ 262
Retained Earnings
Net loss attributable to redeemable noncontrolling interest	1,879	262
Noncontrolling Interest
Net loss attributable to redeemable noncontrolling interest	$ 1,879	$ 262