Revenue, Receivables and Contract Assets and Liabilities (Details 2) - USD ($) $ in Thousands	Nov. 30, 2019	Mar. 02, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 199,831	$ 197,139
Less: allowance for doubtful accounts	(1,855)	(4,372)
Net receivables	197,976	192,767
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	141,448	145,693
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	23,096	19,050
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 35,287	$ 32,396