Costs and Estimated Earnings On Uncompleted Contracts - Accumulated Costs Net Of Billings (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Feb. 28, 2017
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 115,030	$ 127,839
Estimated earnings	57,182	53,598
Total costs and estimated earnings	172,212	181,437
Less billings to date	(151,894)	(151,792)
Total costs net of billings	$ 20,318	$ 29,645