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Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands | Jun. 01, 2019 | Mar. 02, 2019
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Commitments and Contingencies Disclosure [Abstract] |  |
Company's backlog bonded by performance bonds | $ 306,300 |
Face value of performance bonds | 638,900 |
Line of Credit Facility [Line Items] |  |
Project related liability | 38,000 | $ 42,800
Other non-current liabilities | 78,712 | 77,182
Other assets | 45,003 | $ 46,380
Purchase obligations | 132,700 |
Industrial Revenue Bonds |  |
Line of Credit Facility [Line Items] |  |
Debt | 20,400 |
Letter of credit | Industrial Revenue Bonds |  |
Line of Credit Facility [Line Items] |  |
Debt | $ 25,100 |

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