Business And Summary Of Significant Accounting Policies (Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 02, 2017	Sep. 03, 2016
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Total	$ 228,968	$ 216,005
Accumulated Amortization	(118,539)	(110,698)
Customer Relationships [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	187,260	175,160
Accumulated Amortization	$ (92,381)	(85,316)
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)	(23,100)
Trademark [Member]
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	4,403	3,613
Accumulated Amortization	$ (3,058)	(2,282)
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	$ 14,205	$ 14,132