Working Capital (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Feb. 27, 2016	Feb. 28, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 175,329	$ 174,865
Less allowance for doubtful accounts	(2,497)	(3,242)
Net receivables	172,832	171,623
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	102,627	111,494
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	41,631	33,582
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	28,249	24,547
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 2,822	$ 5,242