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Provision for Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss and credit carry forwards | $ 36,978 | $ 33,778 |  |
Accrued expenses | 117,481 | 112,971 |  |
Policy benefits and losses, claims and loss expenses payable, net | 33,736 | 36,374 |  |
Unrealized losses | 32,856 | 48,179 |  |
Operating leases, assets | 11,521 | 12,058 |  |
Total deferred tax assets | 232,572 | 243,360 |  |
Deferred tax liabilities: |  |  |  |
Property, plant and equipment | 1,655,074 | 1,545,628 |  |
Operating leases, liabilities | 11,214 | 12,175 |  |
Deferred policy acquisition costs | 10,709 | 12,038 |  |
Other | 2,700 | 3,008 |  |
Total deferred tax liabilities | 1,679,697 | 1,572,849 |  |
Net deferred tax liability | $ 1,447,125 | $ 1,329,489 | $ 1,199,280 | $ 1,182,123

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: 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 2: 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 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)(b)) -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//1943274/2147479853/942-210-S99-1 + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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