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Investments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | May 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |
Investments | $ 240,431,000 |  | $ 214,847,000
Cash surrender value of insurance policies | 217,200,000 |  | 192,700,000
Equity method investments | 20,100,000 |  | 19,000,000.0
Cost method investments | 3,100,000 |  | $ 3,100,000
Losses due to impairment | $ 0 | $ 0 |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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