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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
12 Months Ended
Feb. 28, 2015
Feb. 29, 2016
Debt Instrument [Line Items]    
Total $ 337,848,000 $ 326,982,000
Less amount due within one year (21,866,000) (23,192,000)
Long-term debt, exculding current maturities 315,982,000 303,790,000
Senior Notes [Member] | Unsecured Senior Notes Due January 2021 [Member]    
Debt Instrument [Line Items]    
Total 125,000,000 125,000,000
Senior Notes [Member] | Unsecured Senior Notes Due March 2012 through March 2018 [Member]    
Debt Instrument [Line Items]    
Total 57,143,000 42,857,000
Annual installments 14,285,714  
Line of Credit [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Total 90,080,000 101,000,000
Term Note [Member] | Term Not Due in Quarterly Installments Beginning in June 2013 through March 2018 [Member]    
Debt Instrument [Line Items]    
Total $ 65,625,000 $ 58,125,000