Revenue (Schedule Of Disaggregation Of Revenue) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Feb. 29, 2020	Mar. 02, 2019	Feb. 29, 2020	Mar. 02, 2019
Disaggregation of Revenue [Line Items]
Net sales		$ 786,094,000	$ 823,004,000	$ 1,609,695,000	$ 1,654,601,000
Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		100.00%	100.00%	100.00%	100.00%
Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 786,094,000	$ 823,004,000	$ 1,609,695	$ 1,654,601
Concentration risk, percentage		100.00%	100.00%	100.00%	100.00%
Manufacturing Heavy [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		47.00%	49.00%	47.00%	49.00%
Manufacturing Light [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		23.00%	22.00%	23.00%	22.00%
Government [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		7.00%	7.00%	7.00%	8.00%
Retail/Wholesale [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		6.00%	6.00%	6.00%	5.00%
Commercial Services [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		5.00%	5.00%	5.00%	4.00%
Other Customers [Member] | Net Sales [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	[1]	12.00%	11.00%	12.00%	12.00%
United States [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 752,300,000	$ 796,995,000	$ 1,540,663	$ 1,603,070
Concentration risk, percentage		96.00%	97.00%	96.00%	97.00%
UK [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 13,274,000	$ 13,769,000	$ 27,356	$ 28,974
Concentration risk, percentage		2.00%	2.00%	2.00%	2.00%
Canada [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 10,147,000	$ 9,299,000	$ 21,258	$ 19,616
Concentration risk, percentage		1.00%	1.00%	1.00%	1.00%
Mexico [Member] | Net Sales [Member] | Geographic Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 10,373,000	$ 2,941,000	$ 20,418	$ 2,941
Concentration risk, percentage		1.00%		1.00%
Mexico [Member] | Net Sales [Member] | Geographic Concentration Risk [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
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.