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Employee and Retiree Benefits (Deferred Compensation Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 31, 2019 | Aug. 25, 2018 | Aug. 26, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer discretionary contribution amount | $ 2.9 | $ 2.3 | $ 1.6
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 | $ 0.9 | 1.1 | $ 1.2
Officers and Managers [Member] | Supplemental Employee Retirement Plan (SERP) [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contractual amount of years after retirement | 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 assets | $ 0.6 | $ 0.4 |
Maximum salary deferral | 50.00% |  |
Maximum cash incentive award deferral | 100.00% |  |

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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