Working Capital (Schedule of Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 01, 2014	Mar. 02, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 157,848	$ 123,663
Less allowance for doubtful accounts	(2,934)	(2,493)
Net receivables	154,914	121,170
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	98,246	73,801
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	39,257	31,313
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	19,040	15,711
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 1,305	$ 2,838