Summary of Significant Accounting Policies - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Aug. 25, 2018	Aug. 26, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,311,407	$ 1,227,440
Less: accumulated depreciation	751,831	702,325
Total property, plant and equipment	559,576	525,115
Land, buildings and leasehold equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	496,966	467,050
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	576,354	540,185
Motor vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 238,087	$ 220,205