Debt (Senior Notes) (Narrative) (Details) (USD $)	1 Months Ended
	Sep. 30, 2012	Jul. 31, 2013	Jan. 31, 2013
Other Committed And Uncommitted Revolving Credit Facilities Expiring on Various Dates Through Fiscal 2017
Debt Instrument [Line Items]
Line of Credit Facility Interest Rate At End of Period		4.41%	2.09%
Debt Instrument Expiration Year		2017
Senior Notes
Debt Instrument [Line Items]
Debt, face value	$ 350,000,000	$ 350,000,000	$ 350,000,000
Debt, stated interest rate in percentage	3.75%		3.75%
Proceeds from issuance of long-term debt	345,800,000
Debt discount	1,300,000	1,105,000	1,238,000
Debt issuance costs	$ 2,900,000
Debt redemption price as a percent of principal amount	100.00%
Treasury Rate | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate	50.00%