Revenue (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 27, 2021	Nov. 28, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 848,547	$ 771,904
Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 848,547	$ 771,904
Concentration risk, percentage	100.00%	100.00%
Manufacturing Heavy [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	48.00%	45.00%
Manufacturing Light [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	20.00%	20.00%
Retail/Wholesale [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	8.00%	7.00%
Government [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	7.00%	11.00%
Commercial Services [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	4.00%	4.00%
Other Customers [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	13.00%	13.00%
United States [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 799,075	$ 726,893
Concentration risk, percentage	94.00%	94.00%
Mexico [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 22,615	$ 20,365
Concentration risk, percentage	3.00%	3.00%
United Kingdom [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 14,595	$ 12,991
Concentration risk, percentage	2.00%	2.00%
Canada [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 12,262	$ 11,655
Concentration risk, percentage	1.00%	1.00%