Debt And Capital Lease Obligations (Capital Lease And Finance Obligations) (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 04, 2017	Sep. 03, 2016
Capital Leased Assets [Line Items]
Amount due under capital leases and financing agreements	$ 28,368	$ 28,268
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