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LEASES - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 USD ($) renewal_option | Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |
Weighted average incremental borrowing rate applied to operating lease liabilities | 2.90% |
Rent expense | $ | $ 4.9 |
Rent expense | $ |  | $ 3.7
Tulsa Corporate Office Lease |  |
Lessee, Lease, Description [Line Items] |  |
Number of renewal options | renewal_option | 2 |
Renewal option term | 5 years |
Tulsa Industrial Facility Lease |  |
Lessee, Lease, Description [Line Items] |  |
Number of renewal options | renewal_option | 2 |
Renewal option term | 2 years |

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- Definition Lessee, Operating Lease, Number Of Options To Extend + References No definition available. + Details
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Period Type: | instant

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | hp_LeaseArrangementAxis=hp_TulsaIndustrialFacilityLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |