Debt And Capital Lease Obligations (Capital Lease And Finance Obligations) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Capital Leased Assets [Line Items]
Amount due under capital leases and financing agreements	$ 27,804	$ 29,564
Capital leases and financing obligations for certain information technology equipment entered into	530	1,353	$ 1,417
Capital leases and financing obligations for certain information technology equipment entered into		1,353
Property and equipment acquired under capital leases and financing agreements	32,535	33,505
Property and equipment acquired under capital leases and financing agreements, accumulated amortization	4,815	3,339
Amortization of capital leases	$ 2,486
Fulfillment Center [Member]
Capital Leased Assets [Line Items]
Capital lease term	20 years
Amount due under capital leases and financing agreements	$ 27,023	27,023
Non-cash financing activity related to the capital lease	$ 0	$ 25,023
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