Debt And Capital Lease Obligations (Capital Lease And Finance Obligations) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 03, 2016	Aug. 29, 2015	Aug. 30, 2014
Capital Leased Assets [Line Items]
Amount due under capital leases and financing agreements	$ 28,268	$ 27,804
New capital leases	1,321
Financing obligations for certain information technology equipment	453	530	$ 1,353
Capital leases and financing obligations for certain information technology equipment entered into		530
Property and equipment acquired under capital leases and financing agreements	30,298	32,535
Property and equipment acquired under capital leases and financing agreements, accumulated amortization	2,878	4,815
Amortization of capital leases	$ 2,073
Fulfillment Center [Member]
Capital Leased Assets [Line Items]
Capital lease term	20 years
Amount due under capital leases and financing agreements	$ 27,022	$ 27,022
Minimum [Member] | Fulfillment Center [Member]
Capital Leased Assets [Line Items]
Capital lease, prepayment term with no penalty	7 years
Maximum [Member] | Fulfillment Center [Member]
Capital Leased Assets [Line Items]
Capital lease, prepayment term with no penalty	20 years