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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 871,558	$ 785,609	$ 827,466	$ 632,212
OCI before reclassifications			0	(68)
Amounts reclassified from AOCI	8	8	17	16
Total other comprehensive income (loss)	8	8	17	(52)
Ending balance	942,364	801,524	942,364	801,524
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(517)	(551)	(526)	(491)
Ending balance	(509)	(543)	(509)	(543)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(517)	(551)	(526)	(559)
OCI before reclassifications			0	0
Amounts reclassified from AOCI	8	8	17	16
Total other comprehensive income (loss)			17	16
Ending balance	$ (509)	(543)	$ (509)	(543)
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				68
OCI before reclassifications				(68)
Amounts reclassified from AOCI				0
Total other comprehensive income (loss)				(68)
Ending balance		$ 0		$ 0

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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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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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