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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Company match of employee salary (in percentage) 4.00%    
Company contributions $ 13,900 $ 12,700 $ 11,400
Underlying assets in non-qualified deferred compensation program 100,423 86,073  
Liability to participants 100,423 86,073  
Estimated liability for post-employment medical benefits $ 8,000 $ 13,200