Sale of Elk Grove Village Building - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Aug. 31, 2012 sqft	Feb. 28, 2013	Feb. 28, 2011	Jul. 23, 2012 sqft
Discontinued Operations [Line Items]
Facility leased to Main Steel Polishing Company, Inc.				240,000
Leasable area of facility				280,000
Proceeds from Sale of Assets	$ 9,200,000	$ 9,180,000	$ 14,089,000
Gain on sales of assets	3,200,000	3,216,000	6,643,000
Tax loss on sale of assets	5,400,000
Expected tax savings due to tax loss	$ 1,800,000
Lease agreement with Torburn	35,000
Lease term	4 years