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Revenue (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 01, 2018	Dec. 02, 2017
Disaggregation of Revenue [Line Items]
Net sales		$ 831,597	$ 768,561
Manufacturing Heavy [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		49.00%
Manufacturing Light [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		22.00%
Government [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		8.00%
Retail/Wholesale [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		5.00%
Commercial Services [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		4.00%
Other Customers [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	[1]	12.00%
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales		$ 806,075
UNITED STATES | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		97.00%
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Net sales		$ 15,205
UNITED KINGDOM | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		2.00%
CANADA
Disaggregation of Revenue [Line Items]
Net sales		$ 10,317
CANADA | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		1.00%
[1] __________________________The other category primarily includes individual customer and small business net sales not assigned to a specific industry classification.

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