Property, Plant and Equipment (Details) (Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2010	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Property, Plant and Equipment (Textual) [Abstract]
Property, plant and equipment disposed		$ 19,000	$ 27,000
Accumulated depreciation of disposed property, plant and equipment		18,000	24,000
Impairment charges	12,206
Depreciation expense		$ 34,210	$ 36,465	$ 39,640