Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Long-term debt gross	$ 810,000	$ 1,048,413
Unamortized debt issuance expense	8,035	6,424
Long-term debt, net of unamortized issuance costs	801,965	1,041,989
Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000	300,000
Unamortized debt issuance expense	6,064	2,705
Line Of Credit And Secured Debt \| Fourth Amended Credit Facility, due 2026 \| Secured Debt
Debt Instrument [Line Items]
Incremental term loan commitment	210,000	748,413
Unamortized debt issuance expense	$ 1,971	$ 3,719

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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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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