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Employee and Retiree Benefits (Deferred Compensation Narrative) (Details) - USD ($)
 12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer discretionary contribution amount $ 1,200,000 $ 1,100,000 $ 865,000
Key Employees [Member] | Non-Qualified Deferred Compensation Program (1981) [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Vesting age 55 years    
Requisite service period 5 years    
Requiste service period prior to December 1992 20 years    
Deferred compensation expense $ 1,300,000 1,400,000 $ 1,500,000
Deferred compensation liabilities 19,500,000 21,000,000  
Officers and Managers [Member] | Supplemental Employee Retirement Plan (SERP) [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation liabilities $ 2,600,000 3,000,000  
Contractual amount of years after retirement 15 years    
Officers and Key Employees [Member] | Executive Deferred Compensation Plan (2007) [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation liabilities $ 299,000 213,000  
Deferred compensation assets $ 297,000 211,000  
Maximum salary deferral 50.00%    
Maximum cash incentive award deferral 100.00%    
Non-Qualified Share Option Program (2001) [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred compensation assets $ 5,400,000 6,400,000  
Deferred share-based compensation liabilities $ 4,800,000 $ 5,600,000  
Additional contribution at initiation 25.00%    
Required option exercise period 15 years