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Fair Value Measurements (Tables) | 9 Months Ended
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Feb. 28, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy | The following tables present our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy.
(In thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Fair Value at February 28, 2018 |
U.S. Treasury and other government |  | $ | - |  |  | $ | 22,209 |  |  | $ | - |  |  | $ | 22,209 |
Corporate bonds |  |  |  |  |  |  | 574 |  |  |  |  |  |  |  | 574 |
Stocks - domestic |  |  | 1,311 |  |  |  |  |  |  |  |  |  |  |  | 1,311 |
Mutual funds - foreign |  |  |  |  |  |  | 48,327 |  |  |  |  |  |  |  | 48,327 |
Mutual funds - domestic |  |  |  |  |  |  | 105,379 |  |  |  |  |  |  |  | 105,379 |
Contingent consideration |  |  |  |  |  |  |  |  |  |  | (14,653 | ) |  |  | (14,653 | )
Total |  | $ | 1,311 |  |  | $ | 176,489 |  |  | $ | (14,653 | ) |  | $ | 163,147 |
(In thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Fair Value at May 31, 2017 |
U.S. Treasury and other government |  | $ | - |  |  | $ | 22,119 |  |  | $ | - |  |  | $ | 22,119 |
Corporate bonds |  |  |  |  |  |  | 797 |  |  |  |  |  |  |  | 797 |
Stocks - domestic |  |  | 2,467 |  |  |  |  |  |  |  |  |  |  |  | 2,467 |
Mutual funds - foreign |  |  |  |  |  |  | 37,435 |  |  |  |  |  |  |  | 37,435 |
Mutual funds - domestic |  |  |  |  |  |  | 101,637 |  |  |  |  |  |  |  | 101,637 |
Contingent consideration |  |  |  |  |  |  |  |  |  |  | (17,979 | ) |  |  | (17,979 | )
Total |  | $ | 2,467 |  |  | $ | 161,988 |  |  | $ | (17,979 | ) |  | $ | 146,476 |
Fair Value and Carrying Value of Financial Instruments and Long-Term Debt | Based on the analysis performed, the fair value and the carrying value of our financial instruments and long-term debt as of February 28, 2018 and May 31, 2017 are as follows:
|  | At February 28, 2018 |
(In thousands) |  | Carrying Value |  |  | Fair Value |
Cash and cash equivalents |  | $ | 264,386 |  |  | $ | 264,386 |
Marketable equity securities |  |  | 155,017 |  |  |  | 155,017 |
Marketable debt securities |  |  | 22,783 |  |  |  | 22,783 |
Long-term debt, including current portion |  |  | 2,183,425 |  |  |  | 2,243,062 |
|  | At May 31, 2017 |
(In thousands) |  | Carrying Value |  |  | Fair Value |
Cash and cash equivalents |  | $ | 350,497 |  |  | $ | 350,497 |
Marketable equity securities |  |  | 141,539 |  |  |  | 141,539 |
Marketable debt securities |  |  | 22,916 |  |  |  | 22,916 |
Long-term debt, including current portion |  |  | 2,090,082 |  |  |  | 2,243,167 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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