Costs and Estimated Earnings On Uncompleted Contracts - Accumulated Costs Net Of Billings (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Feb. 29, 2016
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 127,839	$ 195,751
Estimated earnings	53,598	78,667
Total costs and estimated earnings	181,437	274,418
Less billings to date	151,792	231,238
Total costs net of billings	$ 29,645	$ 43,180