Revenue, Receivables and Contract Assets and Liabilities Accounts Receivable (Details) - USD ($) $ in Thousands	May 29, 2021	Feb. 27, 2021	Feb. 29, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 174,688	$ 177,864
Accounts Receivable, Allowance for Credit Loss	2,255	1,947	$ 2,469
Net receivables	172,433	175,917
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	123,501	120,534
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	2,181	12,163
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 49,006	$ 45,167