Debt (Details) - USD ($) $ in Thousands	May 31, 2019	Feb. 28, 2019
Debt Instrument [Line Items]
Long-term Debt	$ 296,779	$ 240,745
Long-term Debt, Gross	297,000	241,000
Unamortized Debt Issuance Expense	(221)	(255)
Long-term Debt, Excluding Current Maturities	296,779	240,745
Senior Notes [Member] \| Unsecured Senior Notes Due January 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	125,000	125,000
Line of Credit [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 172,000	$ 116,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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-Subparagraph (b)(3)
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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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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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