Long-Term Debt - Summary of long-term debt (Details) - USD ($)	6 Months Ended
Aug. 31, 2019	Feb. 28, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 301,193,000	$ 320,784,000
Less current maturities of long-term debt	(1,884,000)	(1,884,000)
Long-term debt, excluding current maturities	299,309,000	318,900,000
MBFC loan
Debt Instrument [Line Items]
Total long-term debt	20,443,000	22,335,000
MBFC Loan original balance	37,600,000
Remaining principal balance due on March 1, 2020	1,900,000
Remaining principal balance due on March 1, 2021	1,900,000
Remaining principal balance due on March 1, 2022	1,900,000
Remaining principal balance due on March 1, 2023	$ 14,800,000
MBFC loan \| LIBOR \| Maximum
Debt Instrument [Line Items]
Interest rate	2.00%
MBFC loan \| Base rate
Debt Instrument [Line Items]
Interest rate	1.00%
Credit agreement
Debt Instrument [Line Items]
Total long-term debt	$ 280,750,000	$ 298,449,000
Amount of interest rate swap hedge	$ 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 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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