Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Dec. 27, 2015
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ (5,559)	$ (5,965)
Debt and Capital Lease Obligations	977,315	585,500
Long-term Debt and Capital Lease Obligations, Current	0	0
Long-term Debt and Capital Lease Obligations	971,756	579,535
Senior Unsecured 5.00% Due 2028
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Debt Issuance Expense	(2,497)	(3,122)
Incremental Commitment Agreement [Member] \| Secured Debt [Member] \| 2017 Revolver borrowings
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	677,315	285,500
Unamortized Debt Issuance Expense	$ (3,062)	$ (2,843)

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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.

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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 of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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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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