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Stock-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
May 26, 2012
May 28, 2011
May 26, 2012
Stock Options [Member]
May 28, 2011
Stock Options [Member]
May 26, 2012
Stock Options [Member]
May 28, 2011
Stock Options [Member]
May 26, 2012
Restricted Stock [Member]
May 28, 2011
Restricted Stock [Member]
May 26, 2012
Restricted Stock [Member]
May 28, 2011
Restricted Stock [Member]
Aug. 27, 2011
Restricted Stock [Member]
Oct. 31, 2010
Restricted Stock Unit Agreement [Member]
May 26, 2012
Restricted Stock Unit Agreement [Member]
May 28, 2011
Restricted Stock Unit Agreement [Member]
May 26, 2012
Restricted Stock Unit Agreement [Member]
May 28, 2011
Restricted Stock Unit Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Stock-based compensation expense $ 11,410 $ 11,057 $ 1,391 $ 1,446 $ 4,310 $ 4,441 $ 1,919 $ 1,724 $ 5,512 $ 5,330     $ 529 $ 530 $ 1,588 $ 1,286
Stock-based compensation expense, tax benefit     501 530 1,569 1,625                    
Weighted-average grant-date fair values of the stock options granted         $ 17.67 $ 14.48                    
Total intrinsic value of options exercised         14,445 27,443                    
Unrecognized share-based compensation cost     $ 9,169   $ 9,169   $ 17,500   $ 17,500       $ 6,597   $ 6,597  
Unrecognized share-based compensation weighted average period         1 year 8 months 12 days       2 years 3 months 7 days           3 years 4 months 6 days  
Number of shares granted 308                     183        
Number of vesting installments                       2        
Number of shares granted from RSU Agreement                 132           2  
Weighted-average fair value of RSU granted                 $ 67.44           $ 71.84  
Number of unvested RSU outstanding             546   546   618   191   191  
Weighted-average fair value of RSU outstanding             $ 52.49   $ 52.49   $ 46.18   $ 54.86   $ 54.86