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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Oct. 31, 2015
Jun. 01, 2015
Jan. 31, 2015
Dec. 01, 2014
Equity, Class of Treasury Stock        
Treasury Stock Held, Average Cost Per Share $ 44.59   $ 42.95  
Stock Repurchased During Period, Shares 2,497,029      
Stock Repurchased During Period, Cost Per Share $ 58.87      
Stock Issued During Period, Shares, Treasury Stock Reissued (189,564)      
December 2014 Program        
Equity, Class of Treasury Stock        
Stock Repurchase Program, Authorized Amount       $ 100,000
June 2015 Program        
Equity, Class of Treasury Stock        
Stock Repurchase Program, Authorized Amount   $ 100,000