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Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands | Dec. 01, 2018 | Mar. 03, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Company's backlog bonded by performance bonds | $ 224,000 |
Face value of performance bonds | 478,800 |
Line of Credit Facility [Line Items] |  |
Other non-current liabilities | 85,405 | $ 70,646
Other assets | 40,249 | $ 33,674
Purchase obligations | 163,200 |
New Markets Tax Credit |  |
Line of Credit Facility [Line Items] |  |
Other non-current liabilities | 3,200 |
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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