Costs and Estimated Earnings On Uncompleted Contracts - Accumulated Costs Net Of Billings (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 56,499	$ 51,573
Estimated earnings	27,275	33,784
Total costs and estimated earnings	83,774	85,357
Less billings to date	72,666	72,307
Total costs net of billings	$ 11,108	$ 13,050