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Employee and Retiree Benefits - Deferred Compensation Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 25, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer discretionary contribution amount	$ 3.4	$ 2.9	$ 2.3
Key Employees | Non-Qualified Deferred Compensation Program (1981)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Vesting age	55 years
Requisite service period	5 years
Requisite service period prior to December 1992	20 years
Deferred compensation expense	$ 0.9	0.9	$ 1.1
Officers and Managers | Supplemental Employee Retirement Plan (SERP)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contractual amount of years after retirement	15 years
Officers and Key Employees | Executive Deferred Compensation Plan 2007
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum salary deferral	50.00%
Maximum cash incentive award deferral	100.00%
Deferred compensation assets	$ 0.7	$ 0.6

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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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=120391452&loc=d3e13212-122682

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

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- Definition

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- Definition

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