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Employee Benefit Plans Employee Benefit Plans (Details) (USD $)
12 Months Ended
Sep. 01, 2011
Sep. 03, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]  
Employee contribution to 401(k) retirement plan, maximum percentage of eligible pay (in hundredths)0.75 
Employer matching contribution to 401(k) retirement plan, maximum percentage (in hundredths)0.050.04
Employer matching contribution to 401(k) retirement plan, maximum amount $ 2,000
Contribution expense for 401(k) retirement plan$ 26,000,000$ 16,000,000