Revenue, Receivables and Contract Assets and Liabilities Accounts Receivable (Details) - USD ($) $ in Thousands	Nov. 27, 2021	Feb. 27, 2021	Feb. 29, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 167,320	$ 177,864
Accounts Receivable, Allowance for Credit Loss	2,315	1,947	$ 2,469
Net receivables	165,005	175,917
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	124,890	120,534
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	16,266	12,163
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 26,164	$ 45,167