Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 01, 2012	Aug. 27, 2011	Aug. 28, 2010
Summary Of Significant Accounting Policies [Line Items]
Active customer accounts	325,000
Receivables due	30 days
Increase in goodwill	$ 11,693,000
Intangible assets, amortization expense	10,047,000	7,689,000	7,340,000
Deferred principal catalog costs	7,355,000	8,786,000
Advertising costs	14,090,000	14,219,000	17,193,000
Shipping and handling costs	102,550,000	92,442,000	80,854,000
Self insured group health plan maximum liability, per participant	300
Self insured group health plan maximum liability increase, per participant	500
Group health plan expense	43,988,000	37,429,000	34,318,000
Unrecognized tax benefit that would affect effective tax rate	5,376,000	8,272,000
United Kingdom [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum percentage sales from other geographic regions	3
Mexico [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum percentage sales from other geographic regions	1
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	5,656,000	5,900,000	6,253,000
Stock-based compensation expense, tax benefit	2,061,000	2,156,000	2,318,000
Restricted Stock Awards [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	7,448,000	7,053,000	7,272,000
Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	2,158,000	1,815,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days taken to recoup warranty costs from manufacturers	30 days
Monthly lease payment range over the term of the lease	191,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period deferred principal catalog costs remain the most current source of sales	1 year
Warranty period	1 year
Number of days taken to recoup warranty costs from manufacturers	90 days
Monthly lease payment range over the term of the lease	218,000
Leasehold Improvements And Building [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life	5 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	15 years
Trademark [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period	143,000	346,000
Customer Relationships [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period	$ 12,808,000	$ 6,900,000