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Employee and Retiree Benefits (Deferred Compensation Narrative) (Details) - USD ($) | 12 Months Ended
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Aug. 27, 2016 | Aug. 29, 2015 | Aug. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer discretionary contribution amount | $ 1,500,000 | $ 1,200,000 | $ 1,100,000
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 | 1,300,000 | $ 1,400,000
Deferred compensation liabilities | 18,000,000 | 19,500,000 |
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 | $ 2,700,000 | 2,600,000 |
Contractual amount of years after retirement | 15 years |  |
Non-Qualified Share Option Program (2001) [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation assets | $ 3,700,000 | 5,400,000 |
Deferred share-based compensation liabilities | $ 3,300,000 | 4,800,000 |
Additional contribution at initiation | 25.00% |  |
Required option exercise period | 15 years |  |
Executive Deferred Compensation Plan 2007 [Member] | Officers and Key Employees [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation liabilities | $ 389,000 | 299,000 |
Deferred compensation assets | $ 388,000 | $ 297,000 |
Maximum salary deferral | 50.00% |  |
Maximum cash incentive award deferral | 100.00% |  |

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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