Property, Plant and Equipment (Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 25, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 267,172	$ 239,257
Less accumulated depreciation	(139,600)	(138,064)
Total property, plant and equipment, net	127,572	101,193
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	6,799	6,747
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	119,638	94,622
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	107,701	105,663
Software [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	29,169	23,388
Transportation [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,865	$ 8,837