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Commitments and Contingent Liabilities (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Nov. 30, 2013 | Dec. 01, 2012
Commitments and Contingencies Disclosure [Abstract] |  |
Company's backlog bonded by performance bonds | $ 83,200 |
Face value of performance bonds | 240,300 |
Total value of letter of credit | 23,500 |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000 |
Purchase obligations | 75,400 |
Derivative, Notional Amount | 18,600 |
Derivative Asset, Fair Value, Net | 300 |
Proceeds from new markets tax credit transaction, net of deferred costs | 7,752 | 0
Gross proceeds from new markets tax credits | 10,700 |
Deferred Costs | $ 3,000 |

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