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Employee and Retiree Benefits (Deferred Compensation Narrative) (Details) - USD ($) | 12 Months Ended
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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 |  |

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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 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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