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CREDIT ARRANGEMENTS (Long-term Debt) (Details) - USD ($) $ in Thousands | Aug. 31, 2019 | May 31, 2019 | Aug. 31, 2018 | Jul. 31, 2017 | May 31, 2013
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt including current maturities | $ 1,254,921 |  | $ 1,170,129 |  |
Less debt issuance costs | 10,268 |  | 11,764 |  |
Total long-term debt outstanding | 1,244,653 |  | 1,158,365 |  |
Current maturities of long-term debt | 13,510 |  | 19,746 |  |
Less short-term borrowings | 3,929 |  | 0 |  |
Current maturities of long-term debt and short-term borrowings | 17,439 |  | 19,746 |  |
Long-term debt | $ 1,227,214 |  | 1,138,619 |  |
2027 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate | 5.375% |  |  | 5.375% |
Total long-term debt including current maturities | $ 300,000 |  | 300,000 |  |
2026 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate | 5.75% | 5.75% |  |  |
Total long-term debt including current maturities | $ 350,000 |  | 350,000 |  |
2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate | 4.875% |  |  |  | 4.875%
Total long-term debt including current maturities | $ 330,000 |  | 330,000 |  |
Short-term borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt including current maturities | 3,929 |  | 0 |  |
Other, including equipment notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt including current maturities | $ 60,867 |  | 47,629 |  |
Revolving credit agreement | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate | 4.111% |  |  |  |
Total long-term debt including current maturities | $ 210,125 |  | $ 142,500 |  |

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