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Commitments and Contingent Liabilities (Details Textual) - 6 months ended Aug. 27, 2016
CAD in Thousands, $ in Thousands
USD ($)
CAD
USD ($)
Line of Credit Facility [Line Items]      
Company's backlog bonded by performance bonds     $ 125,400
Face value of performance bonds     322,900
Total value of letter of credit     23,500
Purchase obligations     161,809
Gross proceeds from new markets tax credit transaction $ 6,000    
Deferred costs on new market tax credit transaction $ 900    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   CAD 4,000 $ 125,000