Comprehensive Income (Changes in AOCI by component) (Details) - USD ($) $ in Thousands	12 Months Ended
Aug. 31, 2019	Aug. 25, 2018	Aug. 26, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	$ 892
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Change in fair value of interest rate swap, net of tax	(1,415)	$ 1,947	$ (514)
Amounts reclassified from AOCI	32	27	9,705
Reclassification to retained earnings		0
Balance at end of year	(491)	892
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(591)	(509)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Amounts reclassified from AOCI	32	27
Net current-year OCI	32	27
Reclassification to retained earnings		(109)
Balance at end of year	(559)	(591)	(509)
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	1,483	(514)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Change in fair value of interest rate swap, net of tax	(1,415)	1,947
Net current-year OCI	(1,415)	1,947
Reclassification to retained earnings		50
Balance at end of year	68	1,483	(514)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	892	(1,023)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Change in fair value of interest rate swap, net of tax	(1,415)	1,947	(514)
Amounts reclassified from AOCI	32	27
Net current-year OCI	(1,383)	1,974
Reclassification to retained earnings		(59)
Balance at end of year	$ (491)	$ 892	$ (1,023)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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