Accumulated Other Comprehensive Income (Loss) Changes in AOCI by component (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Feb. 24, 2018	Feb. 25, 2017	Feb. 24, 2018	Feb. 25, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (383)	$ 6,952	$ (1,023)	$ 10,975
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
OCI before reclassifications	1,283	(439)	1,917	3,464
Amounts reclassified from AOCI	7	(7,413)	13	(15,339)
Net current-period OCI	1,290	(7,852)	1,930	(11,875)
Balance at end of period	907	(900)	907	(900)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(503)	6,952	(509)	10,975
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
OCI before reclassifications	0	0	0	3,903
Amounts reclassified from AOCI	7	(7,413)	13	(15,339)
Net current-period OCI	7	(7,413)	13	(11,436)
Balance at end of period	(496)	(461)	(496)	(461)
Accumulated Net Gain (Loss) from Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	120	0	(514)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
OCI before reclassifications	1,283	(439)	1,917	(439)
Amounts reclassified from AOCI	0	0	0	0
Net current-period OCI	1,283	(439)	1,917	(439)
Balance at end of period	$ 1,403	$ (439)	$ 1,403	$ (439)

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

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