Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ (8,493)	$ (5,559)
Debt and Lease Obligation	1,113,224	977,315
Long-term Debt and Lease Obligation	1,104,731	971,756
Senior Unsecured 5.00% Due 2028
Debt Instrument [Line Items]
Long-term debt	600,000	300,000
Unamortized Debt Issuance Expense	(6,306)	(2,497)
Incremental Commitment Agreement [Member] \| Secured Debt [Member] \| 2017 Revolver borrowings
Debt Instrument [Line Items]
Incremental term loan commitment	513,224	677,315
Unamortized Debt Issuance Expense	$ (2,187)	$ (3,062)

Line of Credit Facility, Incremental Term Loan Commitment

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- Definition

Amount of short-term and long-term debt and lease obligation.

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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

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Amount of long-term debt and lease obligation, classified as noncurrent.

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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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