Financial Instruments Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014 Rate	Feb. 28, 2013 Rate	Feb. 29, 2012 Rate
Unrecorded Unconditional Purchase Obligation	$ 93,801
Entity-Wide Accounts Receivable, Major Customer, Percentage	18.00%	32.00%
Entity-Wide Revenue, Major Customer, Percentage	10.00%	10.00%	10.30%
Entity-Wide Revenue, Five Largest Customers, Percentage	29.00%	28.00%	26.00%
Standby Letters of Credit [Member]
Letters of Credit Outstanding, Amount	717		817
Letter of Credit [Member]
Letters of Credit Outstanding, Amount	$ 0	$ 273