Debt And Capital Lease Obligations (Capital Lease And Finance Obligations) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Sep. 01, 2012
Capital Leased Assets [Line Items]
Amount due under capital leases and financing agreements	$ 29,564	$ 5,750
Capital leases and financing obligations for certain information technology equipment entered into	1,353	1,417	1,192
Capital leases and financing obligations for certain information technology equipment entered into		1,854
Current maturities of capital lease and financing obligations	1,829	1,684
Property and equipment acquired under capital leases and financing agreements	33,505	8,807
Property and equipment acquired under capital leases and financing agreements, accumulated amortization	3,339	2,072
Amortization of capital leases	1,595
Fulfillment Center [Member]
Capital Leased Assets [Line Items]
Capital lease term	20 years
Amount due under capital leases and financing agreements	27,023	2,000
Non-cash financing activity related to the capital lease	$ 25,023	$ 2,437
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