Employee Benefit Plans - Amounts Recorded in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Aug. 26, 2017	Aug. 27, 2016
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax assets	$ 860	$ 1,119
Accrued liabilities	3,285	4,247
Accumulated other comprehensive loss	(1,374)	(1,788)
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax assets	2,568	4,046
Accrued liabilities	28,801	30,696
Accumulated other comprehensive loss	$ (4,102)	$ (6,463)