Revenue, Receivables and Contract Assets and Liabilities (Details 2) - USD ($) $ in Thousands	Aug. 31, 2019	Mar. 02, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 206,634	$ 197,139
Less: allowance for doubtful accounts	(4,721)	(4,372)
Net receivables	201,913	192,767
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	153,765	145,693
Construction contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	17,822	19,050
Contract retainage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 35,047	$ 32,396