Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	3 Months Ended
May 31, 2019	Feb. 28, 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term debt	$ 321,139,000	$ 320,784,000
Less current maturities of long-term debt	(1,884,000)	(1,884,000)
Long-term debt, excluding current maturities	319,255,000	318,900,000
MBFC Loan
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term debt	20,439,000	22,335,000
Face amount	37,600,000.0
Maturities of Long-term Debt [Abstract]
Outstanding principal payment on March 1, 2020	1,900,000
Outstanding principal payment on March 1, 2021	1,900,000
Outstanding principal payment on March 1, 2022	1,900,000
Outstanding principal payment on March 1, 2023	$ 14,800,000
MBFC Loan \| London Interbank Offered Rate (LIBOR) \| Maximum
Long-term Debt, by Current and Noncurrent [Abstract]
Margin (as a percent)	2.00%
MBFC Loan \| Base Rate
Long-term Debt, by Current and Noncurrent [Abstract]
Margin (as a percent)	1.00%
Credit agreement
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term debt	$ 300,700,000	$ 298,449,000
Maturities of Long-term Debt [Abstract]
Principal amount hedged	$ 225,000,000

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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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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.

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