Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014 segment customer	Aug. 31, 2013	Sep. 01, 2012
Summary Of Significant Accounting Policies [Line Items]
Active customer accounts	364,000
Increase in goodwill	$ 983
Amortization expense	16,851	13,059	10,047
Impairment loss	0	0	0
Deferred principal catalog costs	7,237	6,406
Period deferred principal catalog costs remain the most current source of sales	1 year
Advertising costs	20,799	11,505	14,090
Shipping and handling costs	119,796	105,150	102,550
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	61,018	48,249	43,988
Unrecognized tax benefit that would affect effective tax rate	4,573	4,494
Number of reportable segments	1
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	5,623	5,387	5,656
Stock-based compensation expense, tax benefit	2,023	1,951	2,061
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	8,898	8,309	7,448
Stock-based compensation expense, tax benefit	3,381	3,157	2,830
Restricted Stock Unit Agreement [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	2,167	2,128	2,158
Stock-based compensation expense, tax benefit	823	809	820
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	192
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	4.00%
Leasehold Improvements And Building [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	3 years
Leasehold Improvements And Building [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
Customer Relationships [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period		117,400
Trademark [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period	$ 259	$ 126