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Commitments and Contingent Liabilities (Details Textual) (USD $)
In Thousands, unless otherwise specified
Dec. 01, 2012
Commitments and Contingencies Disclosure [Abstract]  
Company's backlog bonded by performance bonds $ 107,500
Face value of performance bonds 373,600
Total value of letter of credit 35,800
Line of Credit Facility, Maximum Borrowing Capacity 100,000
Letter of credits issued under credit facility 23,400
Purchase obligations 77,800
Other Commitment $ 200