Debt (Details 2) (USD $)	6 Months Ended
Aug. 31, 2013	Feb. 28, 2013
Long-term debt
Total long-term debt	$ 204,147,000	$ 175,000,000
Less current maturities of long-term debt	(96,900,000)	(20,000,000)
Long-term debt, excluding current maturities	107,247,000	155,000,000
Unsecured state industrial development loan
Long-term debt
Face amount	38,000,000
Total long-term debt	29,147,000
Unsecured state industrial development loan \| Minimum
Long-term debt
Interest rate (as a percent)	1.18%
Unsecured state industrial development loan \| Maximum
Long-term debt
Interest rate (as a percent)	1.57%
Unsecured floating interest rate 10 year Senior Notes
Long-term debt
Face amount	75,000,000
Interest rate (as a percent)	6.01%
Debt instrument term	10 years
Variable Rate Basis	three-month LIBOR
Basis spread on variable rate (as percent)	0.90%
Total long-term debt	75,000,000	75,000,000
3.90% unsecured Senior Notes payable
Long-term debt
Face amount	100,000,000
Interest rate (as a percent)	3.90%
Principal payments	20,000,000
Frequency of principal payment	Annual
Total long-term debt	$ 100,000,000	$ 100,000,000
Base Rate \| Unsecured state industrial development loan
Long-term debt
Variable Rate Basis	Base rate
Base Rate \| Unsecured state industrial development loan \| Maximum
Long-term debt
Basis spread on variable rate (as percent)	1.125%
LIBOR \| Unsecured state industrial development loan
Long-term debt
Variable Rate Basis	LIBOR
LIBOR \| Unsecured state industrial development loan \| Maximum
Long-term debt
Basis spread on variable rate (as percent)	2.125%

Represents the term of the debt instrument.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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The effective interest rate at the end of the reporting period.

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Interest rate stated in the contractual debt agreement.

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Amount of the required periodic payments applied to principal.

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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.

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