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Fair Value (Details)
3 Months Ended
Nov. 28, 2020
USD ($)
Nov. 30, 2019
USD ($)
Nov. 30, 2020
USD ($)
ft²
Sep. 30, 2020
USD ($)
Aug. 29, 2020
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value remeasurement of non-financial assets on non-recurring basis $ 0 $ 0      
Fair value remeasurement of non-financial liabilities on non-recurring basis 0 $ 0      
Prepaid purchase of PPE       $ 26,726,000  
Ipmairment charge 26,726,000        
Property, plant and equipment, net $ 297,780,000       $ 301,979,000
Long Island Customer Service Center [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Area of property | ft²     170,000    
Property, plant and equipment, net     $ 15,200,000