Commitments and Contingent Liabilities (Details Textual) $ in Thousands	12 Months Ended
	Feb. 27, 2016 USD ($) Sale_And_Leaseback_Agreement	Feb. 28, 2015 USD ($)	Mar. 01, 2014 USD ($)
Long-term Purchase Commitment [Line Items]
Total rental expense	$ 15,500	$ 18,700	$ 15,400
Number of sale and leaseback agreements | Sale_And_Leaseback_Agreement	1
Deferred gain on sale leaseback arrangements	$ 1,818	1,818
Average annual lease payment	1,000
Company's backlog bonded by performance bonds	134,500
Face value of performance bonds	328,600
Total value of letter of credit	23,500
Line of Credit Facility, Maximum Borrowing Capacity	125,000
Purchase obligations	245,000
Proceeds from new markets tax credit transaction, net of deferred costs		7,800
Deferred benefit from New Markets Tax Credit	10,741	10,741
Deferred Costs		3,300
Other current and non-current liabilities
Long-term Purchase Commitment [Line Items]
Deferred gain on sale leaseback arrangements	2,300
Current Liabilities and Other Non Current Liabilities
Long-term Purchase Commitment [Line Items]
Reserve for environmental liabilities	$ 1,600	$ 1,800