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Debt And Capital Lease Obligations (Capital Lease Obligations) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 02, 2017
Dec. 03, 2016
Sep. 02, 2017
Capital Leased Assets [Line Items]      
Amount due under capital leases and financing agreements $ 28,436   $ 27,829
Borrowings under financing obligations 721 $ 739  
Property and equipment acquired under capital leases and financing agreements 721    
Property and equipment acquired under capital leases and financing agreements, accumulated amortization $ 120    
Fulfillment Center [Member]      
Capital Leased Assets [Line Items]      
Capital lease term 20 years    
Amount due under capital leases and financing agreements $ 27,025   $ 27,025
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