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Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Excess Tax Depreciation and Amortization	$ (253,541)	$ (242,335)
Investment in Joint Venture Basis Differences	(8,744)	(7,813)
Depletable Assets	(3,876)	(3,769)
Right of Use Assets	(5,202)	(5,897)
Inventory	(406)	(548)
Other	(2,908)	(3,506)
Total Deferred Tax Liabilities	(274,677)	(263,868)
Change in Accruals	12,886	13,255
Bad Debts	1,662	1,600
Long-term Incentive Compensation Plan	3,515	3,252
Credits and Other Carryforwards	12,995	12,747
Lease Liability	7,647	8,849
Pension	1,128	1,001
Subtotal	39,833	40,704
Valuation Allowance	(2,000)	(9,205)
Total Deferred Tax Assets	$ 37,833	$ 31,499

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