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Associate Benefit Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Aug. 31, 2013
Omnibus Incentive Plan [Member]
Aug. 31, 2013
Stock Options [Member]
Sep. 01, 2012
Stock Options [Member]
Aug. 27, 2011
Stock Options [Member]
Aug. 31, 2013
Restricted Stock Awards [Member]
Sep. 01, 2012
Restricted Stock Awards [Member]
Aug. 31, 2013
Restricted Stock Units [Member]
Sep. 01, 2012
Restricted Stock Units [Member]
Aug. 27, 2011
Restricted Stock Units [Member]
Jan. 31, 2009
Stock Purchase Plan [Member]
Jan. 31, 2005
Stock Purchase Plan [Member]
Aug. 31, 2013
Stock Purchase Plan [Member]
Sep. 01, 2012
Stock Purchase Plan [Member]
Aug. 31, 2013
Savings Plan [Member]
Sep. 01, 2012
Savings Plan [Member]
Aug. 27, 2011
Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Common stock, shares issued     6,200,000                              
Total intrinsic value of options exercised       $ 16,402 $ 16,185 $ 28,520                        
Total intrinsic value of options exercisable 10,478     10,478                            
Total intrinsic value of options outstanding 21,658     21,658                            
Fair value of shares vested 7,175 6,804                                
Unrecognized share-based compensation cost       8,028       16,188   3,956                
Unrecognized share-based compensation weighted average period       1 year 8 months 12 days       2 years 1 month 6 days   2 years 2 months 12 days                
Number of shares granted from award/units Agreement             141,000   4,000 3,000                
Number of unvested award/units outstanding             505,000 535,000 196,000 192,000 189,000              
Weighted-average fair value of award/units outstanding             $ 59.47 $ 52.37 $ 55.32 $ 54.90 $ 54.68              
Maximum number of shares available for purchase for qualified associates                           5,000        
Percent qualified associates pay for shares, based on closing price of stock                           90.00%        
Additional shares authorized under plan                         300,000          
Maximum number of shares reserved for sale under plan before increase                       800,000            
Maximum number of shares reserved for sale under plan                       1,150,000            
Shares reserved for issuance under plan                             160,000      
Company contributions to savings plan                               $ 5,243 $ 4,738 $ 4,036
Shares purchased by qualified associates                           53,000 52,000      
Average purchase price per share                           $ 70.55 $ 64.71