Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Long-term debt gross	$ 1,087,563	$ 1,090,000
Unamortized debt issuance expense	7,781	6,459
Long-term debt, net of unamortized issuance costs	1,079,782	1,083,541
Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000	600,000
Unamortized debt issuance expense	4,149	5,276
Line Of Credit And Secured Debt \| Amended Credit Facility \| Secured Debt
Debt Instrument [Line Items]
Incremental term loan commitment	487,563	490,000
Unamortized debt issuance expense	$ 3,632	$ 1,183

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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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