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Property, Plant And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Sep. 01, 2018
Sep. 02, 2017
Property, Plant And Equipment [Abstract]      
Capitalized interest, net of accumulated amortization $ 677 $ 716  
Depreciation expense $ 53,243 $ 52,113 $ 54,356