Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended																				0 Months Ended
	Aug. 31, 2013 item	Sep. 01, 2012	Aug. 27, 2011	Aug. 31, 2013 Mexico [Member]	Aug. 31, 2013 Stock Options [Member]	Sep. 01, 2012 Stock Options [Member]	Aug. 27, 2011 Stock Options [Member]	Aug. 31, 2013 Restricted Stock Awards [Member]	Sep. 01, 2012 Restricted Stock Awards [Member]	Aug. 27, 2011 Restricted Stock Awards [Member]	Aug. 31, 2013 Restricted Stock Units [Member]	Sep. 01, 2012 Restricted Stock Units [Member]	Aug. 31, 2013 Minimum [Member]	Aug. 31, 2013 Maximum [Member]	Aug. 31, 2013 Leasehold Improvements And Building [Member] Minimum [Member]	Aug. 31, 2013 Leasehold Improvements And Building [Member] Maximum [Member]	Aug. 31, 2013 Furniture, Fixtures And Equipment [Member] Minimum [Member]	Aug. 31, 2013 Furniture, Fixtures And Equipment [Member] Maximum [Member]	Aug. 31, 2013 Trademark [Member]	Sep. 01, 2012 Trademark [Member]	Sep. 01, 2013 Subsequent Event [Member]
Summary Of Significant Accounting Policies [Line Items]
Active customer accounts	322,000
Receivables due	30 days
Property, plant and equipment estimated useful life															5 years	40 years	3 years	20 years
Increase in goodwill	$ 341,194
Intangible assets acquired during period	117,400	12,808																	126	143
Intangible assets, amortization expense	13,059	10,047	7,689
Deferred principal catalog costs	6,406	7,355
Period deferred principal catalog costs remain the most current source of sales														1 year
Advertising costs	11,505	14,090	14,219
Warranty period														1 year
Number of days taken to recoup warranty costs from manufacturers													30 days	90 days
Shipping and handling costs	105,150	102,550	92,442
Self-insured group health plan maximum liability, per participant	500
Self-insured group health plan reimbursement by Company's stop loss policy, threshold	500
Self-insured group health plan maximum liability increase, per participant																					550
Group health plan expense	48,249	43,988	37,429
Stock-based compensation expense					5,387	5,656	5,900	8,309	7,448	7,053	2,128	2,158
Stock-based compensation expense, tax benefit					1,951	2,061	2,156
Monthly lease payment range over the term of the lease													191	218
Unrecognized tax benefit that would affect effective tax rate	$ 4,494	$ 5,376
Maximum percentage sales from other geographic regions				3.00%