Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 02, 2017	Sep. 03, 2016	Aug. 29, 2015
Commitments And Contingencies [Line Items]
Rental expense, operating leases	$ 12,541	$ 13,428	$ 14,504
Maximum [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2027
Related Party Commitments [Member]
Commitments And Contingencies [Line Items]
Rental expense, operating leases		$ 1,044	$ 2,401
Equipment And Automobile [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2021