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Revenue, Receivables and Contract Assets and Liabilities Accounts Receivable (Details) - USD ($) $ in Thousands | Aug. 29, 2020 | Feb. 29, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 167,649 | $ 199,275
Less: allowance for credit losses | (1,967) | (2,469)
Net receivables | 165,682 | 196,806
Trade accounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 122,870 | 141,126
Construction contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | 3,611 | 20,808
Contract retainage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total receivables | $ 41,168 | $ 37,341

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