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GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Narrative (Details) - USD ($) | Jun. 30, 2019 | Feb. 28, 2019 | Dec. 31, 2018 | Dec. 20, 2018 | Sep. 30, 2018 | Mar. 31, 2015 | Mar. 19, 2015
--- | --- | --- | --- | --- | --- | --- | ---
Financial Information |  |  |  |  |  |  |
Debt issued | $ 500,000,000 |  |  |  |  |  |
Debt outstanding | 491,651,000 |  |  |  | $ 493,968,000 |  |
HPIDC 2025 Notes |  |  |  |  |  |  |
Financial Information |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 500,000,000
Debt outstanding | $ 491,651,000 |  | $ 12,900,000 | $ 12,900,000 | $ 493,968,000 |  |
Company 2025 Notes |  |  |  |  |  |  |
Financial Information |  |  |  |  |  |  |
Debt issued |  |  | $ 487,100,000 | $ 487,100,000 |  |  |
Notes exchanged |  | $ 487,000,000.0 |  |  |  |  |
Helmerich & Payne International Drilling Co. (Issuer) | HPIDC 2025 Notes |  |  |  |  |  |  |
Financial Information |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 500,000,000 |

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