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Net Income Per Share (Tables)
3 Months Ended
Nov. 26, 2011
Net Income Per Share [Abstract]  
Basic And Diluted Net Income Per Common Share Under The Two-Class Method
   
  Thirteen Weeks Ended
     November 26,
2011
  November 27,
2010
Net income as reported   $ 59,837     $ 47,560  
Less: Distributed net income available to participating securities     (119     (621
Less: Undistributed net income available to participating securities     (418      
Numerator for basic net income per share:
                 
Undistributed and distributed net income available to common shareholders   $ 59,300     $ 46,939  
Add: Undistributed net income allocated to participating securities     418        
Less: Undistributed net income reallocated to participating securities     (416      
Numerator for diluted net income per share:
                 
Undistributed and distributed net income available to common shareholders   $ 59,302     $ 46,939  
Denominator:
                 
Weighted average shares outstanding for basic net income per share     62,285       62,370  
Effect of dilutive securities     342       425  
Weighted average shares outstanding for diluted net income per share     62,627       62,795  
Net income per share Two-class method:
                 
Basic   $ 0.95     $ 0.75  
Diluted   $ 0.95     $ 0.75