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v3.19.3

NATURE OF OPERATIONS (Details) | Sep. 30, 2019 country
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International Land |
Segment Reporting Information [Line Items] |
Number of countries in which rigs are primarily located | 4

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hp_InternationalLandSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |