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Revenue (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Nov. 28, 2020 | Nov. 30, 2019
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 771,904 | $ 823,601
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 | $ 771,904 | $ 823,601
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 | 45.00% | 47.00%
Manufacturing Light [Member] | Net Sales [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 20.00% | 23.00%
Government [Member] | Net Sales [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 11.00% | 7.00%
Retail/Wholesale [Member] | Net Sales [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 7.00% | 6.00%
Commercial Services [Member] | Net Sales [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 4.00% | 5.00%
Other Customers [Member] | Net Sales [Member] | Customer Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 13.00% | 12.00%
United States [Member] | Net Sales [Member] | Geographic Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 726,893 | $ 788,364
Concentration risk, percentage | 94.00% | 96.00%
Mexico [Member] | Net Sales [Member] | Geographic Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 20,365 | $ 10,045
Concentration risk, percentage | 3.00% | 1.00%
UK [Member] | Net Sales [Member] | Geographic Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 12,991 | $ 14,082
Concentration risk, percentage | 2.00% | 2.00%
Canada [Member] | Net Sales [Member] | Geographic Concentration Risk [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 11,655 | $ 11,110
Concentration risk, percentage | 1.00% | 1.00%

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