Costs and Estimated Earnings On Uncompleted Contracts - Accumulated Costs Net Of Billings (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 164,809	$ 126,882
Estimated earnings	79,171	50,487
Total costs and estimated earnings	243,980	177,369
Less billings to date	220,930	148,367
Total costs net of billings	$ 23,050	$ 29,002