Consolidated Statements of Equity (Parenthetical) (Noncontrolling Interest, USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Noncontrolling Interest
Net loss attributable to redeemable noncontrolling interest	$ 9,785	$ 4,567	$ 1,925

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