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Investments - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Nov. 30, 2015 | Feb. 29, 2016 | Feb. 28, 2015 | May. 31, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Investments |  |  | $ 118,607,000 |  | $ 329,692,000
Cash surrender value of insurance policies |  |  | 101,300,000 |  | 101,800,000
Equity method investments |  |  | 15,000,000 |  | 225,700,000
Cost method investments |  |  | 2,300,000 |  | $ 2,200,000
Proceeds from sale of business interest in affiliates |  | $ 578,300,000 |  |  |
Dividends received on equity method investment | $ 5,200,000 |  | 0 | $ 5,247,000 |
Cash received from sale of equity method investment | $ 35,200,000 |  |  |  |
Gain on sale of stock of an equity method investment, net of tax |  |  |  | 13,600,000 |
Losses due to impairment |  |  | $ 0 | $ 0 |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + 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 210.5-02.17) -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 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + 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 210.5-02.12) -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 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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