Debt (Components Of Debt) (Details) (USD $)						12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014 Senior Notes	Jan. 31, 2013 Senior Notes	Sep. 30, 2012 Senior Notes	Jan. 31, 2014 Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017	Jan. 31, 2013 Other Committed And Uncommitted Revolving Credit Facilities, Expiring On Various Dates Through Fiscal 2017
Debt Instrument [Line Items]
Debt, stated interest rate in percentage					3.75%
Debt, face value			$ 350,000,000	$ 350,000,000	$ 350,000,000
Less-unamortized debt discount			(974,000)	(1,238,000)	(1,300,000)
Senior notes, net			349,026,000	348,762,000
Capital leases	5,662,000	6,243,000
Revolving credit loan						42,914,000	166,975,000
Debt and capital lease obligations	397,602,000	521,980,000
Less-current maturities (included as Revolving credit loans and current portion of long-term debt, net)	(43,481,000)	(167,522,000)
Long-term debt	$ 354,121,000	$ 354,458,000
Revolving credit loans, interest rate						6.15%	2.09%
Debt instrument expiration year						2017