Summary Of Significant Accounting Policies (Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Sep. 01, 2012
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Total	$ 217,669	$ 100,143
Accumulated Amortization	(62,345)	(48,931)
Customer Relationships [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	175,160	68,160
Accumulated Amortization	(43,998)	(33,826)
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	18 years
Non-Compete Agreements [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	1,348	1,348
Accumulated Amortization	(881)	(395)
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	(16,748)	(14,437)
Weighted Average Useful Life	10 years
Trademark [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Finite Lived	3,380	480
Accumulated Amortization	(718)	(273)
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	5 years
Trademarks And License Agreement [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Indefinite Lived	14,681	7,055
Accumulated Amortization