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Revenue, Receivables and Contract Assets and Liabilities Accounts Receivable (Details) - USD ($) $ in Thousands | May 29, 2021 | Feb. 27, 2021 | Feb. 29, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total receivables | $ 174,688 | $ 177,864 |
Accounts Receivable, Allowance for Credit Loss | 2,255 | 1,947 | $ 2,469
Net receivables | 172,433 | 175,917 |
Trade accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total receivables | 123,501 | 120,534 |
Construction contracts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total receivables | 2,181 | 12,163 |
Contract retainage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total receivables | $ 49,006 | $ 45,167 |

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