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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 1,135,544 | $ 1,027,985
Available-for-sale securities, fair value: |  |
Estimated market value | 1,138,275 | 1,095,338
US Government and Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 20,235 | 43,658
Due after one year through five years | 185,447 | 180,448
Due after five years through ten years | 350,048 | 281,546
Due after ten years | 531,645 | 448,169
Amortized cost | 1,087,375 | 953,821
Available-for-sale securities, fair value: |  |
Due in one year or less | 20,475 | 44,333
Due after one year through five years | 194,563 | 191,930
Due after five years through ten years | 350,953 | 302,188
Due after ten years | 521,289 | 486,780
Estimated market value | 1,087,280 | 1,025,231
Mortgage backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 12,425 | 6,730
Available-for-sale securities, fair value: |  |
Estimated market value | 12,187 | 6,985
Redeemable Preferred Stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 18,445 | 23,705
Available-for-sale securities, fair value: |  |
Estimated market value | 17,533 | 24,212
Equity Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 17,299 | 43,729
Available-for-sale securities, fair value: |  |
Estimated market value | $ 21,275 | $ 38,910

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 + Details
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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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