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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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 26, 2018
Debt Instrument [Line Items]
Medium-term notes principal amount outstanding	$ 370,000	$ 370,000
Derivative, Fair Value, Net			$ 5,400
Five-year term [Member]
Debt Instrument [Line Items]
Number of Years of Bank Credit Agreement	5 years
Term loan	$ 150,000
Debt Instrument, Interest Rate, Effective Percentage	3.94%
Seven-year term [Member]
Debt Instrument [Line Items]
Number of Years of Bank Credit Agreement	7 years
Term loan	$ 220,000
Debt Instrument, Interest Rate, Effective Percentage	4.26%