Revenue, Receivables and Contract Assets and Liabilities Accounts Receivable (Details) - USD ($) $ in Thousands	Aug. 29, 2020	Feb. 29, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 167,649	$ 199,275
Less: allowance for credit losses	(1,967)	(2,469)
Net receivables	165,682	196,806
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	122,870	141,126
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	3,611	20,808
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 41,168	$ 37,341