Comprehensive Income (Loss) Changes in AOCI by component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 28, 2016	May 30, 2015	May 28, 2016	May 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ (2,274)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Balance at end of period	$ 12,633		12,633
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	13,616	$ (2,067)	(2,274)	$ (1,808)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
OCI before reclassifications	0	0	17,701	944
Amounts reclassified from AOCI	(983)	(654)	(2,794)	(1,857)
Net current-period OCI	(983)	(654)	14,907	(913)
Balance at end of period	$ 12,633	$ (2,721)	$ 12,633	$ (2,721)