Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Aug. 27, 2011	Aug. 28, 2010	Aug. 29, 2009
Lease Commitments [Abstract]
Rent expense	$ 7,000	$ 6,300	$ 5,900
Operating Leases, Future Minimum Payments Due [Abstract]
2012	5,432
2013	4,341
2014	2,869
2015	2,505
2016	1,860
Thereafter	2,323
Total	19,330
Environmental and Legal Contingencies [Abstract]
Number of sites related to former operations with environmental issues	3
Estimated impact of inflation per year (in hundredths)	3.00%
Risk-free rates of interest used to discount the remediation costs, minimum (in hundredths)	2.20%
Risk-free rates of interest used to discount the remediation costs, maximum (in hundredths)	3.50%
Rollforward of accrual for environmental liabilities [Rollforward]
Beginning balance	18,986	19,384
Costs incurred for which reserves have been provided	(2,485)	(2,392)
Insurance proceeds received	203	216
Interest accretion	681	794
Changes in discount rates	284	865
Revisions in estimates	699	119
Ending balance	18,368	18,986	19,384
Estimated costs - current dollars [Abstract]
2012	4,333
2013	2,366
2014	1,766
2015	919
2016	766
Thereafter	12,387
Total	22,537
Estimated insurance proceeds [Abstract]
2012	(159)
2013	(173)
2014	(159)
2015	(173)
2016	(159)
Thereafter	(1,893)
Total	(2,716)
Net anticipated costs [Abstract]
2012	4,174
2013	2,193
2014	1,607
2015	746
2016	607
Thereafter	10,494
Total	19,821
Effect of inflation	6,985
Effect of discounting	(8,438)
Balance as of August 27, 2011	18,368
Annual annuities from legal settlement with insurance company	300
Balance of escrow account which funds remediation and monitoring costs for sites related to former operations	3,100
Number of insurance companies paying legal settlements	3
Other Contingent Liabilities [Abstract]
Standby irrevocable bank commercial letters of credit	$ 39,200	$ 35,900

The amount of inflation necessary to increase (reconcile) the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies to the present value recognized on the balance sheet (if the accrual qualifies for inflation).

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Accrual for environmental loss contingencies, net of estimated insurance proceeds, total.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid, net of estimated insurance proceeds expected to be received, after the fifth year of the balance sheet date.

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Amount of discount applied to the future cost of environmental remediation to present value.

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Amount of interest accretion expense recognized during the period that is associated with environmental remediation costs. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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This element represents the percentage added to estimated current cost of decommissioning one of the Company's facilities based on future estimated inflation rate.

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The estimated aggregate undiscounted amount of the estimated insurance proceeds accrual for environmental loss contingencies as of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received after the fifth year of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within five years of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within four years of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within two years of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within three years of the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the insurance proceeds for environmental loss contingencies that is expected to be received within one year of the balance sheet date.

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This element represents the number of insurance companies the Company is entitled to receive legal settlements as reimbursements for environmental remediation costs.

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This element represents the number of sites related to former operations that are subject to remediation of certain hazardous or toxic substances.

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Recorded amount of the individual components comprising the asset for insurance recoveries related to environmental remediation obligations.

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Maximum risk-free rate of interest used to discount the remediation costs. A risk-free rate represents the interest that an investor would expect from an absolutely risk-free investment over a given period of time.

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This element represent the minimum risk-free rate of interest used to discount the remediation costs. A risk-free rate represents the interest that an investor would expect from an absolutely risk-free investment over a given period of time.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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The amount of imputed interest necessary to reduce (reconcile) the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies to the present value recognized on the balance sheet (if the accrual qualifies for discounting).

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The estimated aggregate undiscounted amount of the accrual for environmental loss contingencies as of the balance sheet date.

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The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements.

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Present value of the estimated aggregate accrual for environmental loss contingencies as of the balance sheet date (if the accrual qualifies for discounting).

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The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid after the fifth year after the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid in the fifth year after the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid in the fourth year after the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid in the second year after the balance sheet date.

+ References

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid in the third year after the balance sheet date.

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The portion of the estimated aggregate undiscounted amount of the accrual for environmental loss contingencies that is expected to be paid within one year of the balance sheet date.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The total of future contractually required payments on leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

+ References

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

+ References

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fourth year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

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Cash received for the settlement of litigation during the current period.

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