Consolidated Statements of Equity (Parenthetical) (Unaudited) (Noncontrolling Interest, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Apr. 30, 2012	Jan. 31, 2012
Noncontrolling Interest
Net loss attributable to redeemable noncontrolling interest	$ 1,691	$ 4,567

The portion of net income or loss for the period attributable to redeemable noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. This element should be used for redeemable noncontrolling interests that are classified within temporary equity.

No definition available.

Name:	us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration