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Marketable Securities (Tables) | 12 Months Ended
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May. 31, 2015
Summary of Marketable Securities by Asset Type | The following tables summarize marketable securities held at May 31, 2015 and May 31, 2014 by asset type:
|  | Available-For-Sale Securities |
(In thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value (Net Carrying Amount) |
May 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stocks - foreign |  | $ | 3,722 |  |  | $ | 339 |  |  | $ | (85 | ) |  | $ | 3,976 |
Stocks - domestic |  |  | 34,368 |  |  |  | 5,649 |  |  |  | (559 | ) |  |  | 39,458 |
Mutual funds - foreign |  |  | 32,657 |  |  |  | 2,114 |  |  |  | (230 | ) |  |  | 34,541 |
Mutual funds - domestic |  |  | 56,442 |  |  |  | 228 |  |  |  | (2,779 | ) |  |  | 53,891 |
Total equity securities |  |  | 127,189 |  |  |  | 8,330 |  |  |  | (3,653 | ) |  |  | 131,866 |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and other government |  |  | 21,340 |  |  |  | 171 |  |  |  | (162 | ) |  |  | 21,349 |
Corporate bonds |  |  | 1,218 |  |  |  | 171 |  |  |  | — |  |  |  | 1,389 |
Foreign bonds |  |  | 36 |  |  |  | 2 |  |  |  | — |  |  |  | 38 |
Mortgage - backed securities |  |  | 81 |  |  |  | 47 |  |  |  | — |  |  |  | 128 |
Total fixed maturity securities |  |  | 22,675 |  |  |  | 391 |  |  |  | (162 | ) |  |  | 22,904 |
Total |  | $ | 149,864 |  |  | $ | 8,721 |  |  | $ | (3,815 | ) |  | $ | 154,770 |
|  | Available-For-Sale Securities |
(In thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value (Net Carrying Amount) |
May 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stocks - foreign |  | $ | 984 |  |  | $ | 669 |  |  | $ | (20 | ) |  | $ | 1,633 |
Stocks - domestic |  |  | 31,071 |  |  |  | 8,965 |  |  |  | (132 | ) |  |  | 39,904 |
Mutual funds - foreign |  |  | 30,541 |  |  |  | 2,799 |  |  |  | — |  |  |  | 33,340 |
Mutual funds - domestic |  |  | 44,242 |  |  |  | 1,790 |  |  |  | (1,109 | ) |  |  | 44,923 |
Total equity securities |  |  | 106,838 |  |  |  | 14,223 |  |  |  | (1,261 | ) |  |  | 119,800 |
Fixed maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury and other government |  |  | 21,156 |  |  |  | 152 |  |  |  | (164 | ) |  |  | 21,144 |
Corporate bonds |  |  | 1,544 |  |  |  | 212 |  |  |  | — |  |  |  | 1,756 |
Foreign bonds |  |  | 37 |  |  |  | 3 |  |  |  | — |  |  |  | 40 |
Mortgage-backed securities |  |  | 85 |  |  |  | 55 |  |  |  | — |  |  |  | 140 |
Total fixed maturity securities |  |  | 22,822 |  |  |  | 422 |  |  |  | (164 | ) |  |  | 23,080 |
Total |  | $ | 129,660 |  |  | $ | 14,645 |  |  | $ | (1,425 | ) |  | $ | 142,880 |
Summary of Securities in Unrealized Loss Position and Included in Accumulated Other Comprehensive Income, Aggregated by Length of Time Investments | Summarized below are the securities we held at May 31, 2015 and 2014 that were in an unrealized loss position and that were included in accumulated other comprehensive income, aggregated by the length of time the investments had been in that position:
|  | May 31, 2015 |  |  | May 31, 2014 |
(In thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
Total investments with unrealized losses |  | $ | 58,978 |  |  | $ | (3,815 | ) |  | $ | 35,465 |  |  | $ | (1,425 | )
Unrealized losses with a loss position for less than 12 months |  |  | 32,693 |  |  |  | (1,441 | ) |  |  | 16,611 |  |  |  | (845 | )
Unrealized losses with a loss position for more than 12 months |  |  | 26,285 |  |  |  | (2,374 | ) |  |  | 18,854 |  |  |  | (580 | )
Net Carrying Values of Debt Securities by Contractual Maturity | The net carrying values of debt securities at May 31, 2015, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
(In thousands) |  | Amortized Cost |  |  | Fair Value |
Due: |  |  |  |  |  |  |  |
Less than one year |  | $ | 2,835 |  |  | $ | 2,858 |
One year through five years |  |  | 16,416 |  |  |  | 16,395 |
Six years through ten years |  |  | 2,192 |  |  |  | 2,227 |
After ten years |  |  | 1,232 |  |  |  | 1,424 |
|  | $ | 22,675 |  |  | $ | 22,904 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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