Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Aug. 29, 2015 USD ($) segment customer entity item	Aug. 30, 2014 USD ($)	Aug. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Active customer accounts | customer	366,000
Active customer qualification, number of purchases within twelve months | item	1
Decrease in goodwill	$ 5,709
Amortization expense	16,580	$ 16,851	$ 13,059
Impairment loss	0	0	0
Deferred principal catalog costs	$ 4,948	7,237
Period deferred principal catalog costs remain the most current source of sales	1 year
Advertising costs	$ 24,101	20,799	11,505
Shipping and handling costs	123,900	119,796	105,150
Self-insured group health plan maximum liability, per participant	550
Self-insured group health plan, participant deductible	150
Self-insured group health plan reimbursement by Company's stop loss policy, threshold	550
Group health plan expense	$ 67,061	61,018	48,249
Number of affiliates | entity	1
Unrecognized tax benefit that would affect effective tax rate	$ 4,693	4,573
Number of reportable segments | segment	1
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	$ 4,951	5,623	5,387
Stock-based compensation expense, tax benefit	1,753	2,023	1,951
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	8,139	8,898	8,309
Stock-based compensation expense, tax benefit	3,093	3,381	3,157
Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	1,105	2,167	2,128
Stock-based compensation expense, tax benefit	$ 420	823	$ 809
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Original manufacturers warranty period	30 days
Monthly lease payment range over the term of the lease	$ 196
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Warranty period	1 year
Original manufacturers warranty period	90 days
Monthly lease payment range over the term of the lease	$ 218
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	3.00%
Leasehold Improvements And Buildings [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Leasehold Improvements And Buildings [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	40 years
Furniture, Fixtures And Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Furniture, Fixtures And Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	20 years
Trademark [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase related to new trademarks	$ 212	$ 259