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	$ 107,802	$ 164,809
Estimated earnings	53,598	79,171
Total costs and estimated earnings	161,400	243,980
Less billings to date	152,802	220,930
Total costs net of billings	$ 8,598	$ 23,050