Revenue (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 02, 2019	Mar. 03, 2018	Mar. 02, 2019	Mar. 03, 2018
Disaggregation of Revenue [Line Items]
Net sales		$ 823,004	$ 768,987	$ 1,654,601	$ 1,537,548
Manufacturing Heavy [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		49.00%		49.00%
Manufacturing Light [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		22.00%		22.00%
Government [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		7.00%		8.00%
Retail/Wholesale [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		6.00%		5.00%
Commercial Services [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		5.00%		4.00%
Other Customers [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	[1]	11.00%		12.00%
United States [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 796,995		$ 1,603,070
Concentration risk, percentage		97.00%		97.00%
UK [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 13,769		$ 28,974
Concentration risk, percentage		2.00%		2.00%
Canada [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 9,299		$ 19,616
Concentration risk, percentage		1.00%		1.00%
Mexico [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 2,941		$ 2,941
Concentration risk, percentage		1.00%		1.00%

[1] The other category primarily includes individual customer and small business net sales not assigned to a specific industry classification.