Long-term Debt - Schedule of Long-term Debt (Details) (USD $)	12 Months Ended
Feb. 28, 2014	Feb. 28, 2015
Debt Instrument [Line Items]
Total	$ 405,616,000us-gaap_LongTermDebt	$ 337,848,000us-gaap_LongTermDebt
Less amount due within one year	(20,848,000)us-gaap_LongTermDebtCurrent	(21,866,000)us-gaap_LongTermDebtCurrent
Long-term debt, exculding current maturities	384,768,000us-gaap_LongTermDebtNoncurrent	315,982,000us-gaap_LongTermDebtNoncurrent
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	71,428,000	57,143,000
Annual installments	14,285,714
Line of Credit [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Total	137,000,000	90,080,000
Term Note [Member] \| Term Not Due in Quarterly Installments Beginning in June 2013 through March 2018 [Member]
Debt Instrument [Line Items]
Total	$ 72,188,000	$ 65,625,000

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Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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