Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 01, 2018	Sep. 02, 2017	Sep. 03, 2016
Commitments And Contingencies [Line Items]
Rental expense, operating leases	$ 12,477	$ 12,541	$ 13,428
Maximum [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2028
Related Party Commitments [Member]
Commitments And Contingencies [Line Items]
Rental expense, operating leases			$ 1,044
Equipment And Automobile [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2022