Summary Of Significant Accounting Policies (Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Total	$ 216,290	$ 217,906
Accumulated Amortization	(96,485)	(79,592)
Customer Relationships [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	175,160	175,160
Accumulated Amortization	$ (73,508)	(57,994)
Customer Relationships [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	5 years
Customer Relationships [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	18 years
Non-Compete Agreements [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount		1,348
Accumulated Amortization		(1,210)
Non-Compete Agreements [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	2 years
Non-Compete Agreements [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	3 years
Contract Rights [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	10 years
Gross Carrying Amount	$ 23,100	23,100
Accumulated Amortization	(21,368)	(19,058)
Trademark [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	2,900	3,380
Accumulated Amortization	$ (1,609)	(1,330)
Trademark [Member] | Minimum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	1 year
Trademark [Member] | Maximum [Member]
Intangible Assets By Major Class [Line Items]
Weighted Average Useful Life (in years)	5 years
Trademarks [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Indefinite	$ 15,130	$ 14,918