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Equity Plans - Share Based Compensation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Nov. 29, 2012
Dec. 01, 2011
Nov. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock reserved for issuance for stock options and restricted stock awards (in shares) 160.3    
Number of shares subject to outstanding awards (in shares) 99.4    
Number of shares available for future awards (in shares) 60.9    
Stock Options      
Number of shares granted (in shares) 3.9 5.9  
Weighted average grant date fair value per share for options granted (in dollars per share) $ 2.99 $ 2.95  
Fair Value Assumptions, Method Used Black-Scholes    
Average expected life (in years) 5 years 5 years 1 month  
Weighted-average expected volatility (in hundredths) 62.00% 67.00%  
Weighted-average risk-free interest rate (in hundredths) 0.70% 1.10%  
Restricted Stock Awards      
Number of Shares - Outstanding (in shares)     11.5
Weighted Average Grant Date Fair Value Per Share - Granted (in dollars per share) $ 5.73 $ 5.17  
Service-based awards [Member]
     
Restricted Stock Awards      
Number of Shares - Granted (in shares) 2.2 1.8  
Performance-based shares [Member]
     
Restricted Stock Awards      
Number of Shares - Outstanding (in shares)     3.5
Number of Shares - Granted (in shares) 1.2 1.9