Summary Of Significant Accounting Policies (Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 01, 2012	Aug. 27, 2011
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Total	$ 100,143	$ 87,192
Accumulated Amortization	(48,931)	(38,884)
Customer Relationships [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	68,160	56,460
Accumulated Amortization	(33,826)	(26,711)
Customer Relationships [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	5 years
Customer Relationships [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	10 years
Non-Compete Agreements [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	1,348	360
Accumulated Amortization	(395)	(23)
Non-Compete Agreements [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	2 years
Non-Compete Agreements [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	3 years
Contract Rights [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	23,100	23,100
Accumulated Amortization	(14,437)	(12,127)
Weighted Average Useful Life	10 years
Trademark [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	480	360
Accumulated Amortization	(273)	(23)
Trademark [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	1 year
Trademark [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life	2 years
Trademarks And License Agreement [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Indefinite Lived	7,055	6,912
Accumulated Amortization