Summary Of Significant Accounting Policies (Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 03, 2016	Aug. 29, 2015
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Total	$ 216,005	$ 216,290
Accumulated Amortization	(110,698)	(96,485)
Customer Relationships [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	175,160	175,160
Accumulated Amortization	$ (85,316)	(73,508)
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
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	(23,100)	(21,368)
Trademark [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	3,613	2,900
Accumulated Amortization	$ (2,282)	(1,609)
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	$ 14,132	$ 15,130