Consolidated Statements of Equity (Parenthetical) (Unaudited) (Noncontrolling Interest, USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2013	Apr. 30, 2012
Noncontrolling Interest
Net loss attributable to redeemable noncontrolling interest	$ 6,499	$ 9,785

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

No definition available.

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