Working Capital (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Mar. 04, 2017	Feb. 27, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 187,235	$ 175,329
Less allowance for doubtful accounts	(1,495)	(2,497)
Net receivables	185,740	172,832
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	122,149	102,627
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	31,923	41,631
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	29,191	28,249
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 3,972	$ 2,822