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SIGNIFICANT ACCOUNTING POLICIES (Details 8) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 28, 2018
Apr. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Oct. 06, 2017
Earnings Per Share                        
Basic weighted average shares outstanding 50,431,000 50,424,000 50,449,000 50,817,000 50,617,000 50,601,000 50,587,000 50,475,000 50,530,000 50,570,000 50,313,000  
Net effect of dilutive common stock equivalents based upon the treasury stock method                 307,000 205,000 86,000  
Diluted weighted average shares outstanding 50,901,000 50,751,000 50,741,000 50,957,000 50,947,000 50,801,000 50,755,000 50,599,000 50,837,000 50,775,000 50,399,000  
Potential anti-dilutive share-based payment awards excluded from the computation above                 93,000 44,000 84,000  
Net Income $ 32,788 $ 51,891 $ 50,486 $ 30,505 $ 38,869 $ 36,587 $ 25,482 $ 29,217 $ 165,670 $ 130,155 $ 125,766  
Net income (in dollars per share)                 $ 3.28 $ 2.57 $ 2.50  
Net income (in dollars per share)                 $ 3.26 $ 2.56 $ 2.50  
Treasury Stock [Abstract]                        
Stock Repurchase Program, Authorized Amount                       $ 200,000
Treasury Stock, Shares, Acquired                 614,660      
Treasury Stock, Value, Acquired, Cost Method                 $ (24,231)      
Shipping and Handling Fees and Costs                        
Outbound shipping and handling costs, excluding employee benefit expenses                 $ 582,900 $ 517,200 $ 467,500