Income Taxes - Schedule of Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Excess Tax Depreciation and Amortization	$ (260,577)	$ (253,541)
Investment in Joint Venture Basis Differences	(4,294)	(8,744)
Depletable Assets	(7,710)	(3,876)
Right-of-Use Assets	(4,774)	(5,202)
Inventory	0	(406)
Other	(2,956)	(2,908)
Total Deferred Tax Liabilities	(280,311)	(274,677)
Change in Accruals	13,313	12,886
Bad Debts	1,621	1,662
Long-term Incentive Compensation Plan	3,622	3,515
Credits and Other Carryforwards	11,466	12,995
Lease Liability	6,598	7,647
Inventory	307	0
Pension	1,087	1,128
Subtotal	38,014	39,833
Valuation Allowance	(2,500)	(2,000)
Total Deferred Tax Assets	$ 35,514	$ 37,833

Deferred tax assets, lease liability.

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Deferred tax liabilities, depletable assets.

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Deferred tax liabilities, right of use asset.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from inventory.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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