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Stock-Based Compensation Plans - Share Awards Activity (Details) - $ / shares	12 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 25, 2018
Time-based
Shares
Beginning balance (in shares)	215,506
Granted (in shares)	166,440
Vested (in shares)	(77,550)
Forfeited/canceled (in shares)	(2,132)
Ending balance (in shares)	302,264	215,506
Weighted Average Fair Value
Beginning balance (in dollars per share)	$ 38.27	$ 33.40
Granted (in dollars per share)		42.76
Vested (in dollars per share)		34.45
Forfeited/canceled (in dollars per share)		36.08
Ending balance (in dollars per share)		$ 38.27	$ 33.40
Performance-based
Shares
Beginning balance (in shares)	207,433
Granted (in shares)	64,914
Vested (in shares)	(65,302)	0	0
Forfeited/canceled (in shares)	(18,053)
Ending balance (in shares)	188,992	207,433
Weighted Average Fair Value
Beginning balance (in dollars per share)	$ 40.73	$ 33.87
Granted (in dollars per share)		47.93
Vested (in dollars per share)		28.21
Forfeited/canceled (in dollars per share)		32.79
Ending balance (in dollars per share)		$ 40.73	$ 33.87

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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