Working Capital (Schedule of Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 02, 2013	Mar. 03, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 123,663	$ 111,533
Less allowance for doubtful accounts	(2,493)	(3,109)
Net receivables	121,170	108,424
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	73,801	78,234
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	31,313	19,693
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	15,711	11,348
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 2,838	$ 2,258