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Provision for Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Deferred tax assets: |  |
Net operating loss and credit carry forwards | $ 45,140 | $ 36,978
Accrued expenses | 120,725 | 108,512
Policy benefits and losses, claims and loss expenses payable, net | 36,072 | 33,736
Unrealized losses | 35,272 | 32,856
Operating leases, assets | 9,849 | 11,521
Total deferred tax assets | 259,839 | 232,572
Deferred tax liabilities: |  |
Property, plant and equipment | 1,728,789 | 1,655,074
Operating leases, liabilities | 9,628 | 11,214
Deferred policy acquisition costs | 11,342 | 10,709
Other |  | 2,700
Total deferred tax liabilities | 1,749,759 | 1,679,697
Net deferred tax liability | $ 1,489,920 | $ 1,447,125

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- Definition This extended concept is a combination of two different concepts on the US-GAAP taxonomy: (1) DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities: "Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on trading securities." (2) DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains: "Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on foreign currency transactions." + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated policyholder reserves, which will be deductible from future taxable income when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the tax deduction to be taken. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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