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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Mar. 31, 2014
--- | --- | ---
Available-for-sale securities, amortized cost: |  |
Available-for-sale investments, Amortized cost, total | $ 1,179,977 | $ 1,135,544
Available-for-sale securities, fair value: |  |
Available-for-sale investments, Estimated market value, total | 1,213,312 | 1,138,275
Us Treasury, Government, and Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 24,809 | 20,235
Due after one year through five years | 205,496 | 185,447
Due after five years through ten years | 484,926 | 350,048
Due after ten years | 413,394 | 531,645
Available-for-sale investments, Amortized cost, subtotal | 1,128,625 | 1,087,375
Available-for-sale securities, fair value: |  |
Due in one year or less | 25,355 | 20,475
Due after one year through five years | 216,743 | 194,563
Due after five years through ten years | 499,837 | 350,953
Due after ten years | 416,298 | 521,289
Available-for-sale investments, Estimated market value, subtotal | 1,158,233 | 1,087,280
Mortgage-backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Debt securities, amortized cost | 15,335 | 12,425
Available-for-sale securities, fair value: |  |
Debt securities, fair value | 15,357 | 12,187
Redeemable preferred stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Debt securities, amortized cost | 17,447 | 18,445
Available-for-sale securities, fair value: |  |
Debt securities, fair value | 17,204 | 17,533
Common stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Debt securities, amortized cost | 18,570 | 17,299
Available-for-sale securities, fair value: |  |
Debt securities, fair value | $ 22,518 | $ 21,275

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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