Debt - (Long-term Debt Including Capital Lease Obligations) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 983,813	$ 977,315
Unamortized Issuance Costs	5,181	5,559
Long-term debt, net of unamortized issuance costs	978,632	971,756
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Issuance Costs	2,341	2,497
Secured Debt \| Incremental Commitment Agreement \| Amended Credit Facility, due 2022
Debt Instrument [Line Items]
Incremental term loan commitment	683,813	677,315
Unamortized Issuance Costs	$ 2,840	$ 3,062

Line of Credit Facility, Incremental Term Loan Commitment

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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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.

+ References

No definition available.

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- Definition

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
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- Definition

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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- Definition

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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