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Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands | Aug. 31, 2019 | Mar. 02, 2019
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Commitments and Contingencies Disclosure [Abstract] |  |
Face value of performance bonds | $ 695,700 |
Line of Credit Facility [Line Items] |  |
Project related liability | 34,200 | $ 42,800
Other non-current liabilities | 79,128 | 77,182
Other assets | 45,004 | $ 46,380
Purchase obligations | 124,200 |
Industrial Revenue Bonds |  |
Line of Credit Facility [Line Items] |  |
Debt | $ 20,400 |

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