Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 02, 2018	Sep. 02, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Total	$ 252,207	$ 228,968
Accumulated Amortization	(126,434)	(118,539)
Trademark [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite	14,155	14,205
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	208,260	187,260
Accumulated Amortization	$ (99,229)	(92,381)
Contract Rights [Member]
Finite And Indefinite Lived Intangible Assets [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]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,692	4,403
Accumulated Amortization	$ (4,105)	$ (3,058)
Minimum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	5 years
Minimum [Member] | Trademark [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	1 year
Maximum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	18 years
Maximum [Member] | Trademark [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	5 years