LONG-TERM DEBT - Summary of debt (Details) (USD $)	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Long-term debt
Total long-term debt	$ 433,207,000us-gaap_LongTermDebt	$ 192,607,000us-gaap_LongTermDebt
Less current maturities of long-term debt	(21,900,000)us-gaap_LongTermDebtCurrent	(96,900,000)us-gaap_LongTermDebtCurrent
Long-term debt, excluding current maturities	411,307,000us-gaap_LongTermDebtNoncurrent	95,707,000us-gaap_LongTermDebtNoncurrent
Unsecured state industrial development loan
Long-term debt
Interest rate (as a percent)	1.92%
Total long-term debt	35,707,000	37,607,000
Unsecured state industrial development loan \| Base Rate \| Maximum
Long-term debt
Basis spread on variable rate (as percent)	1.00%
Unsecured state industrial development loan \| LIBOR \| Maximum
Long-term debt
Basis spread on variable rate (as percent)	2.00%
Unsecured floating interest rate 10 year Senior Notes
Long-term debt
Interest rate (as a percent)	6.01%
Total long-term debt		75,000,000
Unsecured floating interest rate 10 year Senior Notes \| LIBOR
Long-term debt
Basis spread on variable rate (as percent)	0.90%
3.90% unsecured Senior Notes payable
Long-term debt
Face amount	100,000,000
Interest rate (as a percent)	3.90%
Interest rate (as a percent)	3.90%
Principal payments	20,000,000
Total long-term debt	60,000,000	80,000,000
Credit Agreement
Long-term debt
Total long-term debt	$ 337,500,000

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

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the 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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