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Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 23, 2019
Feb. 24, 2018
Feb. 29, 2020
Feb. 23, 2019
Aug. 31, 2019
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross $ 315,405     $ 315,405   $ 267,172
Less accumulated depreciation 145,565     145,565   139,600
Property, plant, and equipment, net 169,840     169,840   127,572
Depreciation 4,134 $ 3,099 $ 3,100 7,720 $ 6,268  
Land            
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross 10,749     10,749   6,799
Buildings and building improvements            
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross 156,865     156,865   119,638
Machinery and equipment            
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross 113,957     113,957   107,701
Software            
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross 29,622     29,622   29,169
Transportation            
Property, Plant and Equipment [Line Items]            
Property, plant, and equipment, gross $ 4,212     $ 4,212   $ 3,865