Employee Benefit Plans - Amounts Recorded in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Aug. 25, 2018	Aug. 26, 2017
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax assets	$ 362	$ 860
Accrued liabilities	1,124	3,285
Accumulated other comprehensive loss	(1,037)	(1,374)
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred tax assets	1,081	2,568
Accrued liabilities	27,547	28,801
Accumulated other comprehensive loss	$ (3,098)	$ (4,102)