Debt Debt (Details)			9 Months Ended
	Oct. 31, 2013 Credit Agreement [Member] USD ($)	Oct. 31, 2013 Credit Agreement [Member] CNY	Oct. 31, 2013 Total Credit Facilities [Member] USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period			3.26%
Line of Credit Facility, Remaining Borrowing Capacity	$ 95,166,000		$ 566,852,000
Line of Credit Facility, Amount Outstanding	57,428,000		252,016,000
Letters of Credit			4,003,000
Line of Credit Facility, Interest Rate at Period End	6.00%	6.00%
Line of Credit Facility, Maximum Borrowing Capacity	$ 152,594,000	930,000,000