Commitments and Contingent Liabilities (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2015 Sale_And_Leaseback_Agreement	Mar. 01, 2014	Mar. 02, 2013
Long-term Purchase Commitment [Line Items]
Total rental expense	$ 18,700	$ 15,400	$ 13,000
Number of sale and leaseback agreements	1
Deferred gain under sale and leaseback transactions	1,818	2,621
Average annual lease payment	1,000
Company's backlog bonded by performance bonds	76,900
Face value of performance bonds	274,000
Total value of letter of credit	23,500
Line of Credit Facility, Maximum Borrowing Capacity	125,000
Purchase obligations	158,900
Proceeds from new markets tax credit transaction, net of deferred costs		7,800
Gross proceeds from new markets tax credits	10,741	10,741
Deferred Costs		3,300
Other current and non-current liabilities
Long-term Purchase Commitment [Line Items]
Deferred gain under sale and leaseback transactions	$ 2,800