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Debt (Details 2) (USD $)					6 Months Ended					12 Months Ended		6 Months Ended
	Aug. 31, 2014	Feb. 28, 2014	Aug. 31, 2014 MBFC Loan	Feb. 28, 2014 MBFC Loan	Aug. 31, 2014 MBFC Loan Base Rate	Aug. 31, 2014 MBFC Loan Base Rate Maximum	Aug. 31, 2014 MBFC Loan LIBOR	Aug. 31, 2014 MBFC Loan LIBOR Maximum	Feb. 28, 2014 Unsecured floating interest rate 10 year Senior Notes	Feb. 28, 2014 Unsecured floating interest rate 10 year Senior Notes LIBOR	Feb. 28, 2014 Unsecured floating interest rate 10 year Senior Notes Interest rate swaps	Aug. 31, 2014 3.90% unsecured Senior Notes payable	Feb. 28, 2014 3.90% unsecured Senior Notes payable
Long-term debt
Face amount			$ 37,610,000						$ 75,000,000			$ 100,000,000
Basis spread on variable rate (as percent)						1.125%		2.125%		0.90%
Variable Rate Basis					Base rate		LIBOR			three-month LIBOR
Interest rate (as a percent)												3.90%
Interest rate (as a percent)			1.91%								6.01%	3.90%
Frequency of principal payment												Annual
Principal payments												20,000,000
Total long-term debt	115,707,000	192,607,000	35,707,000	37,607,000					75,000,000			80,000,000	80,000,000
Less current maturities of long-term debt	(21,900,000)	(96,900,000)
Long-term debt, excluding current maturities	$ 93,807,000	$ 95,707,000

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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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